#include <stdio.h>

int main()
{
    freopen("adunare.in","r",stdin);
    freopen("adunare.out","w",stdout);

    int a,b;

    scanf("%d%d",&a,&b);
    
    a = (a|b)-(a&b);
    b = ((a^b)&b);
    a=a^b;
    b=(a|b)-(a&b);
    a=a^b;
    a=a<<1;
    a = (a^b);
    b = ((a^b)&b);
    a=(a|b)-(a&b);
    b=a^b;
    a=(a|b)-(a&b);
    a=a<<1;
    a = (a^b);
    b = (((a|b)-(a&b))&b);
    a=a^b;
    b=a^b;
    a=a^b;
    a=a<<1;
    a = (a^b);
    b = ((a^b)&b);
    a=a^b;
    b=a^b;
    a=a^b;
    a=a<<1;
    a = (a|b)-(a&b);
    b = ((a^b)&b);
    a=a^b;
    b=a^b;
    a=(a|b)-(a&b);
    a=a<<1;
    a=a+b;
    printf("%d\n",a);

    return 0;
}