#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int N, K;
	cin >> N >> K;
	if (1 + N <= K) { puts("INF"); return 0; }
	
	int ans = 0;
	for (int a = N; a <= N * 2; a = (a + 1) | N) {
		for (int b = a; a - b <= K; b = ((b ^ N) - 1) | N) {
			if ((a & b) == N) ++ans;
		}
	}
	cout << ans << endl;
}