#include <iostream>

using namespace std;

long long a, b;

long long it(long long x, long long y){
    return (max((long long)0,y-x+1));
}

long long f(long long x){
    if(x==0) return 0;
    long long help = 0;
    long long tart = 0;
    for(long long i=1; i*i<=x; i++){
        help += (x/i);
        tart = i;
    }

    for(long long i=1; i*i<=x; i++){
        long long aa = x/(i+1);

        long long bb = x/i;


        help += it(max(tart+1,aa+1),bb)*i;
    }

    return help;

}

int main()
{
    cin >> a >> b;

    cout << f(b)-f(a-1);

    return 0;
}