#include <iostream> #include <iomanip> using namespace std; int main(){ int givedays; int days=1; int togolds=0; int nowgolds=1; cin>>givedays; int nowdays=0; for(days=1;days<=givedays;++days){ togolds=togolds+nowgolds; nowdays++; if(nowdays==nowgolds){ nowgolds++; nowdays=0; } } cout<<togolds; }