#include <stdio.h>
int sum(int ara[], int n) {
    if (n==1) return ara[0];
    return ara[0] + sum(ara+1, n-1);
}
int main() {
    int ara[] = {1, 2, 3, 4, 5};
    printf("%d\n", sum(ara, 5));
    return 0;
}