#include<bits/stdc++.h> using namespace std; int n,a[10001],k,w,b[30001]; int main(){ cin>>n>>k; for(int i=1;i<=n;i++)cin>>a[i],b[a[i]]++; while(k&&w<=30000)if(b[++w])k--; if(w<=30000)cout<<"NO RESULT"; else cout<<w; return 0; }