10170 - The Hotel with Infinite Rooms

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long int s,m,i,sum;
    while(cin>>s>>m)
    {
        sum=0;
        for(i=s; ; i++)
        {
            sum+=i;
            if(sum==m || sum>m )
               {
                cout<<i<<endl;
               break;

               }
        }
    }
    return 0;
}