#include<bits/stdc++.h> using namespace std; int main(){ int n,m; cin>>n; vector c; for(int i=0;i<n;i++){ cin>>m; c.push_back(m); } cin>>m; for(int i=n-1;i>=0;i--) if(c[i]>m){ cout<<i+1; return 0; } cout<<-1; }