x, d, h, m = map(int, input().split())

end_days = {
    1: 24,
    2: 25,
    3: 26,
    4: 27,
    5: 29
}

end_day = end_days[x]
end_hour = 23
end_min = 59

def to_minutes(day, hour, minute):
    return (day * 24 + hour) * 60 + minute

start = to_minutes(d, h, m)
end = to_minutes(end_day, end_hour, end_min)

result = end - start

dst_day = 29
dst_hour = 2

dst_time = to_minutes(dst_day, dst_hour, 0)

if start < dst_time <= end:
    result -= 60

print(result+1)