#include<cstdio>
(802)#include<cmath>
int main(void){
    int n,A[1000],m,temp;
    while(scanf("%d",&n)!=EOF){
        scanf("%d",&A[0]);
        for(int i=1;i<n;++i){
            scanf("%d",&temp);
            for(int j=i;j>0;--j){
                if(A[j-1]>temp)
                    A[j]=A[j-1];
                else {
                    A[j]=temp;
                    break;
                }
                if(temp<A[0])
                    A[0]=temp;
            }
        }
        scanf("%d",&m);
        int mth=1,loc=0;
        while(mth!=m){
            if(A[loc+1]!=A[loc]){
                ++mth;
            }
            ++loc;
        }
        printf("%d
",A[loc]);
    }
    return 0;
}
//测试用例通过了90%，出问题的那个用例却检查不出哪里出了问题？好奇怪