UVa 1363

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#include<vector>
#define fo(i,a,b) for(int i=a;i<=b;i++)
#define fod(i,a,b) for(int i=a;i>=b;i--)
using namespace std;
typedef long long ll;
ll n,k,
ans;
ll sum(ll a,ll d,ll n) {
return ll(2*a-n*d)*(n+1)/2;
}

int main() {
while(cin>>n>>k) {
ans=0; ll i=1;
while(i<=n) {
ll q=k%i,p=k/i,cnt=n-i;
if(p>0) cnt=min(cnt,q/p);
ans+=sum(q,p,cnt);
i=i+cnt+1;
}
printf("%lld\n",ans);
}
return 0;
}