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x , d , h, m = map(int, input().split())
finish = [0, 24, 25, 26, 27, 29]

doba_w_minutach = 24*60
h_d_w_minutach = 60*h+m

res = (finish[x] - d)*doba_w_minutach + doba_w_minutach - h_d_w_minutach

if x == 5 and (d in [27, 28]):
    res -= 60
if x == 5 and (d in [29]) and (h in [0,1]):
    res -= 60

print(res)