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

/*int multiplu(int n)
{
  for(int i=1;i<n-1;i++)
    if(sqrt(n*i)*sqrt(n*i)==n*i)
       return n*i;
}*/

int main()
{
    /*char s[101];
    int n, i,ok=0;
    cin.getline(s,100);
    n=strlen(s);
    for(i=0;i<n;i++)
        if(s[i]=='<')ok=1;
        else if(s[i]=='>')ok=0;
        else if(s[i]>='a' && s[i]<='z'&& ok==1)s[i]-=32;
    cout<<s;*/
    ifstream fin("bac.in");
    int x,y,z,dmin=1e6,vmax=-1;
    fin>>x>>y;
    while(fin>>z)
    {
        if(y>x && y>z)
        {
            if(dmin>abs(x-z)) {dmin=abs(x-z); vmax=y;}
            else if(dmin==abs(x-z)&& vmax<y)vmax=y;
        }
        x=y;
        y=z;
    }
    if(vmax==-1)cout<<"nu exista";
    else cout<<vmax;
    return 0;
}