#include<stdio.h>
void sort(int,int*);
int main(){
    int size,ind,k,itr;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid Input");
        returnm 0;
    }
    int arr[size];
    for(ind=0;ind<size;scanf("%d",&arr[ind++]));
    scanf("%d",&k);
    sort(size,arr);
    if(k>0&&k<=size){
        printf("%d",*(arr+k-1));
        
    }
    else{
        printf("Invalid Input");
    }
    return 0;
}
void sort(int s,int *ar){
    for(int it=1;it<s;it++){
        for(int ind=0;ind<s-it;ind++){
            if(ar[ind]>ar[ind-1]){
                int temp=ar[ind];
                ar[ind]=ar[ind+1];
                ar[ind+1]=temp;
            }
        }
    }
}