/*#include <stdio.h>
#include <stdlib.h>
int main()
{
printf("Hello world!\n");
return 0;
}
*/
/*#include <stdio.h>
int main ()
{
int a,b;
scanf("%d",&a);
printf("%d",!a);
return 0;
}
*/
/*#include<stdio.h>
int main()
{
int a,b;
scanf("%d %d",&a,&b);
printf("%d",a&&b);
return 0;
}
*/
/*#include<stdio.h>
int main ()
{
int a,b;
scanf("%d %d",&a,&b);
printf("%d",a||b);
return 0;
}
*/
/*#include<stdio.h>
int main ()
{
int a,b, x;
scanf("%d %d",&a,&b);
x = (a>b)?(a):(b);
printf("%d",x);
return 0;
}
*/
/*#include<stdio.h>
int main()
{
int a,b,d,c,f;
scanf("%d %d %d",&a,&b,&d);
c = (a>b)?(b):(a);
f = (c>d)?(d):(c);
printf("%d",f);
return 0;
}
*/
/*#include <stdio.h>
int main ()
{
int a, b, c;
scanf("%d", &a);
if(a%2==0 ) {
}
if(a > 50 && a < 100) {
printf("^^^^");
if(a%2==0 ) {
printf("!@#$!@@4");
}
}
else if(a > 30 ) {
printf("~~~~");
}
else if(a > 10) {
printf("@@@");
}
else {
printf("%$%$%$");
}
}
*/
#include <stdio.h>
int main ()
{
int a,b,c;
scanf("%d %d %d",&a,&b,&c);
if(a%2==0){
printf("%d",a);}
if(a%2==!0){
printf("%d",)
}
}