import sys
input = sys.stdin.readline
def MI():
    return map(int, input().split())
import math
a,b=MI()
a%=12
for sec in range(3600*2):
    newb=b+sec//60
    newa=a+0
    if 60<=newb<120:
        newa+=1
    elif newb>=120:
        newa+=2
    newa%=12
    newb%=60
    nsec=sec%60
    #print(newa,newb,sec)
    #print(11*sec+660*newb-3600*newa)
    if -11<11*nsec+660*newb-3600*newa<=0:
        print(sec)
        break