#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    int n, k;
    cin >> n >> k;

    if (k >= n + 1) {
        cout << "INF" << endl;
    } else {
        int s = 0;
        for (int i = n; i <= n * 2; i++) {
            for (int j = i - k; j <= i; j++) {
                if ((i & j) == n) s++;
            }
        }
        cout << s << endl;
    }

    return 0;
}