#include <iostream>
using namespace std;
int main() {
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
int a[100000];
int n;
cin >> n;
for (int i = 0; i < n; ++i)
{
cin >> a[i];
}
int ans = 0;
int x = a[0], y = a[n-1];
int l = 0, r = n - 1;
for (int i = 0; i < n; ++i)
{
if (a[l+1] == x)
{
l++;
ans++;
}
if (a[r-1] == y)
{
++ans;
r--;
}
}
cout << ans;
}