Pascal triangel recursively

#include <stdio.h>

int pascal(int n, int k);

void main(){
    int n, k;
    scanf("%d %d", &n, &k);
    printf("%d\n", pascal(n, k));
}

int pascal(int n, int k){
    if (k == 0 || k == n)
        return 1;
    return (pascal(n - 1, k - 1) + pascal(n - 1, k));
}