# Enter your code here. Read input from STDIN. Print output to STDOUT
n, m = [int(i) for i in raw_input().strip().split()]

def getCuts(n, m):
    if n <= 1 and m <= 1:
        return 0        
    big = max(n,m)
    if big == n:
        return 1 + getCuts(n-1,m)
    else:
        return 1 + getCuts(n,m-1)
    
print(getCuts(n,m))