#include <iostream>
using namespace std;
//coins challenge
int money(int n)
{
int ten,five,cent,total;
ten=n/10;
five=((n%10)>5?1:0);
cent=(n%10)%5;
total=ten+five+cent;
return total;
}
int main()
{
int n;
cin>>n;
cout<<money(n)<<endl;
}
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