Counter

from collections import deque

x = int(input().strip())

if x == 0:
    print(0)
    exit()

dist = [-1] * (x + 1)
dist[0] = 1
q = deque([0])

while q:
    v = q.popleft()

    u = v + 11
    if u <= x and dist[u] == -1:
        dist[u] = dist[v] + 1
        if u == x:
            print(dist[u] - 1)
            exit()
        q.append(u)

    u = v - 2
    if u >= 0 and dist[u] == -1:
        dist[u] = dist[v] + 1
        if u == x:
            print(dist[u] - 1)
            exit()
        q.append(u)

print(-1)

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

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED