#include <stdio.h>

#define q(f,x) f(f(f(f(x))))
#define qw(f,h,x) f(h,f(h,f(h,f(h,x))))
#define qwe(f,i,h,x) f(i,h,f(i,h,f(i,h,f(i,h,x))))
void aho() {
    printf("\n");
}

char *Po(char *r) {
    printf("%s", r);
    return r;
}

int main() {
    qwe(qw,q,Po,"Hello world\n");
    return 0;
}