#include <bits/stdc++.h>
using namespace std;
int main()
{
long long s,d,size,sum;
while(cin>>s>>d)
{
sum=0;
for(size=s;size<=d;size++)
{
sum=sum+size;
if(sum>=d)
{
printf("%lld\n",size);
break;
}
}
}
return 0;
}
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