#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int s=0,i=1,n=0; while(s<=1000){ s+=i; n+=1; i++; } cout<<n; return 0; }