py
#输入
x1 = list(input().split())
x2 = list(input().split())
计算公式
a = int(x1[0])
b = int(x1[1])
c = int(x2[0])
d = int(x2[1])
x = (c-a)*60+d-b
#输出
print(x)
py
#输入
x1 = list(input().split())
x2 = list(input().split())
a = int(x1[0])
b = int(x1[1])
c = int(x2[0])
d = int(x2[1])
x = (c-a)*60+d-b
print(x)