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def main():
    x,d,h,m = map(int,input().split())
    n = 2160
    if x == 1:
        if d == 23:
            h -= 12
        else:
            n -= 720
        h *= 60
        n -= h
        n -= m
        print(n)
        exit()
    if x == 2:
        if d == 24:
            h -= 12
        else:
            n -= 720
        h *= 60
        n -= h
        n -= m
        print(n)
        exit()
    if x == 3:
        if d == 25:
            h -= 12
        else:
            n -= 720
        h *= 60
        n -= h
        n -= m
        print(n)
        exit()
    if x == 4:
        if d == 26:
            h -= 12
        else:
            n -= 720
        h *= 60
        n -= h
        n -= m
        print(n)
        exit()
    else:
        n = 3600
        if d == 27:
            h -= 12

        elif d == 28:
            n -= 720

        else:

            n -= 2160
        if d != 29 or h < 2:
            n -= 60
        h *= 60
        n -= h
        n -= m
        print(n)

main()