Check max value from three variables by using preprocessor in C

I want to print the value of the variable, which has the highest value. I want to do this by using the preprocessor, but I don't know how to do this. It's easy to do this by using if-else, but how to do that by using preprocessor? This is my code

#include <stdio.h>
#define MAX(a,b,c)
#if a > (b && c)
#   define a
#endif
#if b > (a && c)
#   define b
#else
#   define c
#endif

int main (void)
{
    int wynik;
    int a = 6;
    int b = 13;
    int c = 9;
    wynik = MAX(a,b,c);
    printf("%i", wynik);

    return 0;
}

And this is the errors from my terminal

E:\skrypty_c>gcc -o Cwiczenie12_4.exe Cwiczenie12_4.c
Cwiczenie12_4.c: In function 'main':
Cwiczenie12_4.c:17:11: error: expected identifier or '(' before '=' token
     int c = 9;
           ^
Cwiczenie12_4.c:18:23: error: expected expression before ';' token
     wynik = MAX(a,b,c);