#include <iostream>
#include <cstdio>
using namespace std;
int main(){
long long S, D, Sum, temp;
while(cin >> S >> D){
Sum = 0, temp = S;
while(1){
Sum += S;
S += 1;
if(Sum >= D)break;
}
long long ans = S-1;
cout << ans << endl;
}
return 0;
}
#include <cstdio>
using namespace std;
int main(){
long long S, D, Sum, temp;
while(cin >> S >> D){
Sum = 0, temp = S;
while(1){
Sum += S;
S += 1;
if(Sum >= D)break;
}
long long ans = S-1;
cout << ans << endl;
}
return 0;
}
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