#include <stdio.h>

int main() {
   int i,array[10]={ 17,23,34,54,12,56,31,56,56,12};
   
   int sum = array[3] + array[0];
   int difference = array [3] - array[2];
   
   printf("sum of the 1st and 4th element of the array: %d\n", sum);
   printf("difference between 4th and 3rd element of the array:%d\n", difference);
   return 0;
}