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#include <iostream>

#include <string>

#include <vector>

#include <algorithm>

#include <queue>

#include <list>

#include <stack>

#include <map>

#include <set>

using namespace std;

#define DEBUG

#define REP(i,a) for(i=0;i<a;i++)

#define FOR(i,a,b) for(i=a;i<b;i++)

#define VE vector<int>

#define SZ size()

#define PB push_back

const int MAXM = 90000, INF=100000000;

int squres[MAXM], N;

int dp[MAXM];

int main(){

cin>>N;

for(int i=0; i<MAXM; i++)dp[i] = INF;

dp[0] = 0;

for(int i=0; i*i<=N; i++){

for(int j=i*i; j<=N; j++){

dp[j] = min(dp[j], dp[j-i*i]+1);

}

}

cout<<dp[N]<<endl;

return 0;

}