Binge watching

m=[]
for i in range(int(input())):
    a,b= map(int, input().split())
    m.append([a,b])
m.sort(key=lambda x: x[1])
s=0
t=0
for a,b in m:
    if a>=t:
        s=s+1
        t=b

print(s)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED