#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *left,*right;
}Node;
Node *root=NULL;
void create(int num){
    Node *newnode=(Node*)malloc(sizeof(Node));
    newnode->data=num;
    newnode->left=NULL;
    newnode->right=NULL;
    return newnode;
}
Node *insert(Node *root,int num){
    if(root==NULL)
    return create(num);
    if(num<root->data)
    root->left=insert(root->left,num);
    if(num>root->data)
    root->right=insert(root->right,num);
    return root;
}
void min(){
    if(root!=NULL){
        printf("%d",root->left);
    }
}
int main(){
    int n,i,num;
    if(scanf("%d",&n)!=1){
        printf("Invalid input");
        return 0;
    }
    for(i=0;i<n;i++){
        if(scanf("%d",&num)!=1){
            printf("Invalid input");
            return 0;
        }
        root=insert(root,num);
    }
    min();
    return 0;
}