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p = input().split()
r, d, g, m = p
r = int(r)
d = int(d)
g = int(g)
m = int(m)
res = 0
k = d % 23
if r == 5:
    r+=1
if k!=r:
    res +=(24*60)
    k += 1
    if r == 6:
        if k == 5:
            res+= (23*60)
        else:
            res-=60
res += ((23 - g) * 60 + (60-m))
if d==29 and (g == 1 or g == 0):
    res -= 60
print(res)