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- #include<cstdio>
- #include<iostream>
- using namespace std;
- int main()
- {
- long s,d;
- while(cin>>s>>d)
- {
- long sum=0;
- for(long i=s;;i++)
- {
- sum+=i;
- if(sum>=d)
- {
- cout<<i<<endl;
- break;
- }
- }
- }
- return 0;
- }
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