What is the output of the following C program?#include int f(int n) { if (n

What is the output of the following C program?

#include <stdio.h>
int f(int n) {
    if (n <= 1) return 1;
    return n * f(n - 2);
}
int main() {
    printf("%d", f(7));
    return 0;
}