Tontti

'''
Created on 1.10.2015

@author: siiri
'''
n, m =input().split(" ")
s=1
l = 1
e=0
for i in range(1, int(m)+1):
    a, b, h = input().split(" ")
    if int(a) == s and int(a)<int(b) and l%2!=0:
        s=int(b)
        e += int(h)
        l += 1
    if int(a)== s and int(a)<int(b) and l%2 == 0:
        s=int(b)
        l += 1

print(e)
        
        

Test 1

Group: 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 2

Group: 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 3

Group: 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 4

Group: 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 5

Group: 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 6

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 7

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 8

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 9

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 10

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 11

Group: 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 12

Group: 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 13

Group: 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 14

Group: 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)

Test 15

Group: 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 6, in <module>
    n, m =input().split(" ")
ValueError: too many values to unpack (expected 2)