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import sys

def solve():
    x, d, h, m = map(int, sys.stdin.read().split())

    end_day = 23 + x if x <= 4 else 29
    minutes = (end_day - d) * 1440 + (24 - h) * 60 - m

    if x == 5 and (d < 29 or (d == 29 and h < 2)):
        minutes -= 60

    print(minutes)

solve()