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import sys

x, d, h, m = map(int, sys.stdin.readline().split())

k = [0, (24+1)*24*60, (25+1)*24*60, (26+1)*24*60, (27+1)*24*60, (29+1)*24*60 ]

v = d*24*60 + h*60 + m
r = k[x] - v
if x == 5 and v <= 29*24*60 + 2*60: r-= 60

print(r)