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x, d, h, m = [int(x) for x in input().split()]
poczatek = h*60+m
koniec = 48*60
if (x + d) % 2 != 0:
    poczatek += 24*60
elif d == 29:
    poczatek  += 48*60
if x == 5:
    koniec += 24*60
    if d == 27 or d == 28 or (d == 29 and (h <= 2)):
        print(koniec-poczatek-60)
    else:
        print(koniec-poczatek)
else:
    print(koniec-poczatek)