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#include <bits/stdc++.h>
using namespace std;
const int N = 1e4 + 10;
//常数，正无穷大
const int INF = 0x3f3f3f3f;
int a[N];
int Max = -INF, len = 1;
/*
1 1
一个数字，这个数字是1
最长的连续长度是几？
1
*/
int main() {
int n;
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
if (i > 1) {
if (a[i] - a[i - 1] == 1)
len++;
else
len = 1;
}
Max = max(Max, len);
cout << Max << endl;
return 0;
