#include <stdio.h>
#include <windows.h>
#define N 4
#include <iostream>
using namespace std;
int main(){
int matrix[N][N] = {{1,2,3,4},
{5,6,7,8},
{9,10,11,12},
{13,14,15,16}};
int granica = N - 1;
int summ=0;
for(int i=0; i < 4; ++i){
for(int j = 0; j < granica; ++j){
summ+=matrix[i][j];
}
granica--;
}
cout << summ << endl;
return 0;
}