#include <stdio.h>


int xplusthree(int x)
{
    return x + 3;
}


int main()
{
    extern int call(int (*f)(int), int x);
    printf("%d\n", call(xplusthree, 58));
    return 0;
}


int call(int (*f)(int), int x)
{
    return (*f)(x);
}