#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <ctype.h>
#include <stdbool.h>

void check_heap(int size, int* array){
    int i;
    for(i = 0; i < size; i++){
        int c = (2 * i) + 1; 
        if(c >= size) break;
        
        if(!(array[c] >= array[i])){
            printf("Nie je to kopa.\n");
            return;
        }     
        
        c = (2 * i) + 2;
        if(c >= size) break;
        if(!(array[c] >= array[i])){
            printf("Nie je to kopa.\n");
            return;
        }
    
    } 
    printf("Je to kopa:\n");

}


void space(int l){
    int i = 0;
    for(i = 0; i < l; i++){
        printf(" ");
    }

}

void print(int *arr, int i, int size, int c, int level){
    if(i >= size){
        return;
    } 
    space(level);
    printf("%d\n", arr[i]);
    print(arr,i*2+1, size, c, level+1);

    print(arr, i*2+2, size, c, level+1);
} 


int main() {
    char* cisla = calloc(100, sizeof(char));
    
    fgets(cisla, 100, stdin);
    int size = cisla[strlen(cisla)-1];
    int* num = calloc(size, sizeof(int));
    char *end;
    int i = 0;
    while(i != size){     
        if(i == 0){
            long int c = strtol(cisla, &end, 10);
            num[i] = c;
            
        }  
        else{
            long int next = strtol(end, &end, 10);
            num[i] = next;
        }
        i++;

    }
    i = 0;
    int count = 0;
    while(num[i] != 0){
        count++;
        i++;
    }
    i = 0;
    int index = 0;
    int l = 0;
    int k = 36;
    check_heap(count, num);
    int j = 0;
    print(num, index, count,num[0],l);
    return 0;
}