#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
int main()
{
	int a;
	scanf("%d",&a);
	a/=10;
	int ans=a;
	ans+=a/5*2;
	a%=5;
	ans+=a/3;
	cout<<ans<<endl;
	return 0;
}

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