#include<iostream> using namespace std; int main(){ /** int i,sum = 0,n,m,q,b,s,g; cin>>n; for(i = 1;i<=n;i++){ cin>>m; g = m % 10; s = m / 10 % 10; b = m % 1000 /100; q = m / 1000; if(g == s + b + q) sum += m; } cout<<sum; cout<<endl; long long n,sum = 0; cin>>n; for(int a = 1;a<=n;a++){ sum += a * a; } cout<<sum; **/ int s = 0; int n = 0; while(s <= 1000){ n++; s += n; } cout<<n; return 0; }