def yukicoder1236(A, B):
    x = [0, 3927, 7854, 11781, 15709, 19636, 23563, 27490, 31418, 35345, 39272, 43200]
    n = (A % 12) * 3600 + B * 60
    for i in range(12):
        if x[i] - n >= 0:
            return x[i] - n
    

A, B = map(int, input().split())
print(yukicoder1236(A, B))