# include<iostream> # include<cstdio> using namespace std; int main() { /* int k,n=1,n1,n2,i; cin>>k; if(k==1||k==2){ cout<<1; } else{ n1=1; n2=1; for(i=3;i<=k;i++){ n=n1+n2; n1=n2; n2=n; } cout<<n; } */ /* int n=1; cout<<"1"<<" "; for(int i=1;i<=29;i++){ n=n*2+1; cout<<n<<" "; } */ int s,sum,i; i=1; while(sum<=1000){ sum+=i; i++; } cout<<sum; return 0; }