L = [i*60 / 11 for i in range(12)]

A, B = map(int, input().split())
A %= 12

X = 0
if L[A] < B:
    X = (60 - B + L[A+1]) * 60
elif L[A] > B:
    X = (L[A] - B) * 60

print(int(X))