1 #include <stdio.h>
 2 
 3 int main(){
 4     unsigned int random;
 5     random = rand();    // random value!
 6 
 7     unsigned int key=0;
 8     scanf("%d", &key);
 9 
10     if( (key ^ random) == 0xdeadbeef ){
11         printf("Good!\n");
12         system("/bin/cat flag");
13         return 0;
14     }
15 
16     printf("Wrong, maybe you should try 2^32 cases.\n");
17     return 0;
18 }