import bisect,collections,copy,itertools,math,string
import sys
def I(): return int(sys.stdin.readline().rstrip())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def main():
    
    lst = [0,65.45454545454545,130.9090909090909,146.36363636363637,261.8181818181818,327.27272727272725,392.72727272727275,458.1818181818182,523.6363636363636,589.0909090909091,654.5454545454545,720]
    a, b = LI()
    if a>=12:
        a -= 12

    mn  = a* 60+ b
    nxt = 0

    while mn>lst[nxt]:
        nxt += 1

    ans = (lst[nxt]-mn)*60
    ans = int(ans)

    print(ans)





main()