include<bits/stdc++.h>

using namespace std; int a[10005]; int b[10005]; int c[10005]; int main(){

int p;
int sum=0;
cin>>p;
for(int i=1;i<=p;i++)
{
	cin>>a[i];
	if(b[a[i]]==0)
	{
		sum++;
	}
	b[a[i]]++;
}
int t=1,s=p;
int l=1;
int r=1;
c[a[l]]=1;
while(l<=r&&r<=p)
{
	if(t==sum)
	{
		s=min(s,r-l+1);
		c[a[l]]--;
		if(c[a[l]]==0)
		{
			t--;
		}
		l++;
	}
	else
	{
		r++;
		if(c[a[r]]==0)
		{
			t++;
		}
		c[a[r]]++;
	}
}
cout<<s;
return 0;

}