import sys
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(max(1000, 10**9))
write = lambda x: sys.stdout.write(x+"\n")


a,b = list(map(int, input().split()))
a %= 12
vals = [(i, 30*i/(360/3600 - 30/3600)) for i in range(11)]
vals.append((11,3600))
b *= 60
if vals[a][1]>b:
    ans = (vals[a][1]-b)//1
elif vals[a][1]==b:
    ans = 0
else:
    ans = (vals[a+1][1]-b+3600)//1
print(int(ans))