URI 1150 Solution

#include <iostream>

using namespace std;

int main()

{

    int X,Y;

    int count=0,sum=0;

    cin>>X;

    do

    {

        cin>>Y;

    }while(Y<=X);

    for(int i=X; sum<Y; i++)

    {

        sum+=i;

        count++;

    }

    cout<<count<<endl;

    return 0;

}