#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define rep(i,l,r) for(int i=l;i<r;i++)
#define LINF (ll)1e18
#define INF (int)1e9
struct aaa{aaa(){cin.tie(0); ios::sync_with_stdio(0); cout<<fixed<<setprecision(10);};}aaaaaaa;
inline void in() {}
template <class Head, class... Tail>
inline void in(Head&& head,Tail&&... tail){
    cin>>head;
    in(move(tail)...);
}
template <class T>
inline void out(T t) {
    cout<<t<<'\n';
}
template <class Head, class... Tail>
inline void out(Head head,Tail... tail){
    cout<<head<<' ';
    out(move(tail)...);
}
int main(){
    int n;
    in(n);
    int a[n];
    rep(i,0,n)in(a[i]);
    int max=a[n-1]-a[0];
    for(int i=n-1;i>0;i--)a[i]-=a[i-1];
    out(*min_element(a+1, a+n),max);
}