#include<bits/stdc++.h> using namespace std; int main() { int m,n; cin>>m>>n; int t=m; int s=0; while(t<=n) //枚举m到n之间的所有数 { if(t%17==0) //判断17的倍数 { s+=t; } t++; } cout<<s; return 0; }

#include<bits/stdc++.h>
using namespace std;
int main()
{
	double x;
	cin>>x;
	double cost;
	if(x<=20)
	{
		cost=x*1.68;
	}
	else
	{
		cost=x*1.98;
	}
	cout<<fixed<<setprecision(2)<<cost;
	return 0;
}