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#include <bits/stdc++.h>
using namespace std;
const int N = 100010;
int a[N]; // 原数组
int b[N]; // 记个数的桶
int res;
int main() {
int n;
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1, j = 1; i <= n; i++) {
b[a[i]]++; // a[i]这个数在桶中的个数+1
while (b[a[i]] > 1) b[a[j++]]--; // 如果因为a[i]的加入，导致桶中a[i]的数量大于1
// 也就是有了重复，则需要从窗口左侧尝试去掉一个，看看情况会不会变好
// 不断刷新滑动容器长度
res = max(res, i - j + 1);
}
printf("%d\n", res);
return 0;
