#include<iostream> using namespace std; int main(){ int sum = 0; /**for(int i = 11;b <i;i--){ sum +=a * b; a ++; b ++; } for(int a = 1,b = 2;b<=11 and a<=10;b++,a++){ sum+=a * b; } **/ for(int i = 1;i<= 10;i++){ sum+= i * (i +1); } cout<< sum; return 0; }