Consider the following C program.
#include <stdio.h>
int main () {
    int a[4][5] = {{1, 2, 3, 4, 5},
      {6, 7, 8, 9, 10},
      {11, 12, 13, 14, 15},
      {16, 17, 18, 19, 20}};
    printf("%dn", *(*(a+**a+2)+3));
    return(0);
}

The output of the program is _______