codeforce - chips

#include<bits/stdc++.h>
using namespace std;
#define fastread()(ios_base::sync_with_stdio(false),cin.tie(NULL));
int main()
{
    fastread();
    int m,n;
    cin>>m>>n;
    int i=1,sum=0;
    while(i<=n)
    {
            sum+=i;
            n-=i;
            i++;
            i%=(m+1);
    }
    sum=n-sum;
    cout<<n<<endl;
    return 0;
}