[51nod p2102] or subtraction and [bit operation]

$link$

analysis ：

Or minus and Is XOR It can also be calculated directly

CODE：

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#define reg register
using namespace std;
typedef long long ll;
ll a,b;
int main(){
    
	scanf("%lld%lld",&a,&b);
	printf("%lld",(a|b)-(a&b));
// printf("%lld",a^b);
	return 0;
}