#include<bits/stdc++.h>
#define ALL(v) std::begin(v),std::end(v)
using lint=long long;
using lubl=long double;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint n,k;std::cin>>n>>k;
    if(n<k){
        std::cout<<"INF"<<'\n';
        return 0;
    }
    lint N=1ll<<(lint)std::log2(2*n);
    lint ans=0;
    for(lint x=0;x<=N;x++){
        if(~x&n)continue;
        for(lint y=x;y<=std::min(N,x+k);y++){
            if(~y&n||x&y&~n)continue;
            ans++;
        }
    }
    std::cout<<ans<<'\n';
}