#include <stdio.h>
#include <stdlib.h>
# define N 1000
#define M 1000000
int main() {
long int i,j,n,m;
long int c[N];
long int sp[M];
long int mps;
mps=-1;
scanf("%ld",&n);
 
m=0;
for (i = 0; i <n-1; i++){    
scanf("%ld", &c[i]);
 
j=i+1;
 
while (j< n) {  
 scanf("%ld", &c[j]);
 
if ((c[i]+c[j])%2==0) {
sp[m]=(c[i]+c[j]);
printf("%ld ",sp[m]);
m=m+1;
}
j++;
}}
for (i= 0; i < m; i++) {
if ( sp[i]>mps) {
 mps= sp[i];
}}
printf("%ld \n",mps);
printf("\n ");
system("pause");
 return 0;
}

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