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

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))