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import sys

def manipulation_system():
    #l1 = "1 23 12 0"
    #l1 = "5 28 13 14"
    l1 = sys.stdin.readline()
    l1 = l1.split()
    norundy = int(l1[0])
    dzen = int(l1[1])
    godz = int(l1[2])
    minu = int(l1[3])

    start = dzen * 24 * 60 + godz * 60 + minu
    koniec = (norundy + 23) * 24 * 60 + 23 * 60 + 59
    if norundy == 5:
        koniec += 24 * 60


    przes = (29 * 24   +    2  ) * 60

    if koniec > przes:
        koniec -= 60

    if start > przes:
        start -= 60

    
    wy = koniec - start +1
    print(wy)

manipulation_system()