v = input().split()

if v[0] == '?':
    if int(v[1]) < int(v[2]):
        print('4')
    else:
        print('1')
elif v[1] == '?':
    print('14')
elif v[2] == '?':
    if int(v[0]) < int(v[1]):
        print('1')
    else:
        print('4')