import std.stdio, std.string, std.conv;
import std.range, std.algorithm, std.array;

void main() {
    int n;
    int[] a;

    scan(n);
    a = readln.split.to!(int[]);

    int[int] p;

    int l, ans;

    foreach (i ; 0 .. n) {
        if (a[i] in p) {
            l = max(l, p[a[i]] + 1);
        }

        ans = max(ans, i - l + 1);
        p[a[i]] = i;

        debug {
            writeln(p);
        }
    }

    writeln(ans);
}



void scan(T...)(ref T args) {
    import std.stdio : readln;
    import std.algorithm : splitter;
    import std.conv : to;
    import std.range.primitives;

    auto line = readln().splitter();
    foreach (ref arg; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}



void fillAll(R, T)(ref R arr, T value) {
    static if (is(typeof(arr[] = value))) {
        arr[] = value;
    }
    else {
        foreach (ref e; arr) {
            fillAll(e, value);
        }
    }
}