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import sys

def read_input():
    x, d, h, m = map(int, sys.stdin.readline().strip().split())
    return x, d, h, m

daty = {
    1: 24,
    2: 25,
    3: 26,
    4: 27,
    5: 29
}

def compuute(x, d, h, m):
    
    if x != 5:
        if d == daty[x]:
            return ((24-h)*60 - m)
        else:
            return ((24-h)*60 - m) + 24*60
    else:
        if d == 29:
            if h > 2:
                return ((24-h)*60 - m)
            else:
                return ((23-h)*60 - m)
        if d == 28:
            return ((24-h)*60 - m) + 23*60
        if d == 27:
            return ((24-h)*60 - m) + 47*60

x, d, h, m = read_input()

print(compuute(x, d, h, m))