[백준 BoJ] 17626 - Four Squares

// https://www.acmicpc.net/problem/17626
// Four Squares
#include<iostream>
#include<algorithm>
using namespace std;

int dp[50001] = { 0, };

int main() {
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);

	int N;

	cin >> N;

	for (int i = 1; i <= N; i++) {
		dp[i] = i;
		for (int j = 1; j*j <= i; j++) {
			dp[i] = min(dp[i], dp[i - j * j] + 1);
		}
	}
	cout << dp[N];
}