请问这个代码哪里错了？

#include "stdio.h"

int max (int x , int y)

{

int z;

if(x>y);

  z=x;

else

  z=y;

return（z）;

}

void main()

{

int si,s2;

printf("Input the firet number:");

scanf("%d",&s2);

printf("max=%d\n",max(si,s2);