a,b=map(int,input().split())
x=[0, 3927, 7854, 11781, 15709, 19636, 23563, 27490, 31418, 35345, 39272, 43200]
now=(a%12)*3600+b*60
for i in range(12):
    if x[i]-now>=0:
        print(x[i]-now)
        exit()