include stdio include stdlib define define PN printf int main void int

#include <stdio.h>
#include <stdlib.h>
#define N 4
#define PN printf("\n")
int main(void)
{ int mass[N][N],i,j,summ=0;
printf("INPUT MATRIX:\n");
//input matrix
for(i=0;i<N;i++)
for(j=0;j<N;j++)
scanf("%d", &mass[i][j]);
PN;
//job
for(i=0;i<N;i++)
for(j=0;j<N;j++)
if(j>N-i-1) summ+=mass[i][j];

//test
for(i=0;i<N;i++)
{for(j=0;j<N;j++)
printf("%d ", mass[i][j]);
PN;
}
PN;
//out
printf("%d\n",summ);
  
  system("PAUSE");	
  return 0;
}