#include<cstdio>

const int N = 22*1024*1024;

main(){
      char *tab = new char[N];
      for(int i=0; i<N; i++) tab[i]=i;
      int res = 0;
      for(int i=N-1; i>=0; i--) res+=tab[i];
      printf("%d\n",res);
      delete[] tab;
}