#include "bits/stdc++.h"
using namespace std;

int main(){
  int N,ans=0;
  cin >> N;
  int data[N];
  for(auto&& x: data)cin >> x;
  for(int i=0;i<N-1;++i){
    if(data[i]>data[i+1]){
      if(ans<data[i+1])ans=data[i+1];
    }
  }
  cout << ans <<endl;
  return 0;
}