DSA03035.cpp

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <cstring>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
#include <stack>
#include <cmath>
#include <iomanip>
#include <cstdlib>
#include <numeric>
#include <unordered_set>
using namespace std;

#define ll long long
// MAX (long long) 1000000000000000000
//#define M 100 + 5
#define N 200

#define MOD (ll) 1000000007
#define ld long double
#define FOR(i, a, b) for(int i = a; i <= b; i++)
#define FORD(i, a, b) for (int i = a; i >= b; i--)
#define faster() ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
#define zero(n) setw(n) << setfill('0')
#define stp(n) fixed << setprecision(n)

int main() {
	int n;
	cin >> n;

	vector<int> v(n);

	for (int i = 0; i < n; i++) cin >> v[i];

	vector<int> f(n + 1, 0);

	int l_max = 0;

	for (int i = 0; i < n; i++) {
		f[v[i]] = f[v[i] - 1] + 1;
		l_max = max(l_max, f[v[i]]);
	}

	cout << n - l_max << endl;

	return 0;
}