#include <iostream>
#include <cmath>
using namespace std;
int main(){
	int n,count=0;
	cin>>n;
	n=n/10;
	count=n;
	if(n/5){
		count+=(n/5)*2;
		n=n-5*(n/5);
	}
	if(n/3){
		count+=(n/3);
	}
	cout<<count;
	return 0;
}

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