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#!/usr/bin/env python3

import sys


def main():
    change_at = 29 * 24 * 60 + 2 * 60
    X, D, H, M = [int(x) for x in input().split()]
    deadline = (24 + (X if X < 5 else 6)) * 24 * 60
    started = D * 24 * 60 + H * 60 + M
    result = deadline - started
    if X == 5 and started <= change_at:
        result -= 60
    print(result)


if __name__ == "__main__":
    if len(sys.argv) == 2:
        sys.stdin = open(sys.argv[1])
    main()