#include <iostream>
#define GetMax(a,b,c,d) a>b?(a>c?(a>d?a:d):(c>d?c:d)):\
                                                       \
                            (b>c?(b>d?b:d):(c>d?c:d))
using namespace std;

int main()
{
    float x=GetMax(3,2,1,5) ;
    cout <<x << endl;
    return 0;
}

#include <iostream>
#define GetMax(a,b,c,d) (a)>(b)?((a)>(c)?((a)>(d)?(a):(d)):((c)>(d)?(c):(d))):\
                            ((b)>(c)?((b)>(d)?(b):(d)):((c)>(d)?(c):(d)))
using namespace std;

int main()
{
    float x=GetMax(8,2,1,5) ;
    cout <<x << endl;
    return 0;
}