why WA 5, my program works at all tests on the board, please help me, admin give me this test if you can :(

#include <iostream>

using namespace std;

long long j,p[100],n,m,i,n2[100],k;

long long ans(long long n)
{
     if (n <= 1) return 0;
     i = 31;
     while (n2[i] > n)
     i = i - 1;


     if (n2[i] == n) return p[i] + ans(n - (1<<i)) ; else
     return p[i] + (i-1) + ans(n - (1<<i));
}

int main()
{
    p[0] = 0;
    p[1] = 0;
    n2[0] = 1;
    n2[1] = 2;
    for (i = 2; i <= 32; i++)
    {
        n2[i] = n2[i-1]*2;
        p[i] = p[i-1]*2 + (i-1);
    }


    cin>>n>>m;
    long long anss = ans(n) - ans(m);
        if (anss < 0) anss *= -1;
        cout<<anss<<endl;


    return 0;
}