#include <stdio.h>
    void first(int (*x)(int));
    int second(int i);
    int (*third)(int) = second;
    int main()
    {
        first(third(13));
    }
    void first(int (*k)(int))
    {
        k(12);
    }
    int second(int k)
    {
        printf("%d\n", k);
        return k;
    }