#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <map>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <algorithm>
#include <array>
#include <unordered_set>
#include <unordered_map>
#include <string>
using namespace std;

bool rcmp(int a, int b) { return a>b; }
typedef long long LL;



int main() {
    int n, i, a, b, c1, c2;
    int r;
    scanf("%d %d", &a, &b);
    c1=min(a, b)*2;
    c2 = a+b-c1;
    r=abs(c1-c2);
    while(c1>c2) {
        r=min(r, c1-c2);
        c1-=2; c2+=2;
    }
    r=min(r, abs(c1-c2));
    printf("%d\n", r);
    return 0;
}