x,y=map(int,input().split())
if x==0 and y==0:
    print(0)
else:
    r=1 if x==0 or y==0 else 2
    if (x+y)%2!=0:
        b=float('inf') 
    elif abs(x)==abs(y):
        b=1
    else:
        b=2
    print(min(r,b))