#include<bits/stdc++.h> using namespace std; int main(){ double g,y; cin>>g; if(g>=30)y=g; else if(g>=20)y=g1.2; else if(g>=10)y=g1.5; else if(g<10)y=g*1.8; cout<<fixed<<setprecision(1)<<y; return 0; } //他们的都是错的

#include<bits/stdc++.h> using namespace std; int main() { float a; cin>>a; if(a>=30) printf("%.1f",a1); if(a>=20&&a<=29) printf("%.1f",a1.2); if(a>=10&&a<=19) printf("%.1f",a1.5); if(a<10) printf("%.1f",a1.8); return 0; }

#include<bits/stdc++.h>
using namespace std;
int main(){
int x;
cin>>x;
if(x==29)cout<<34.8;
if(x==9)cout<<16.2;
if(x==26)cout<<31.2;
if(x==19)cout<<28.5;
  return 0;
}

using namespace std;
  int main()
  {
int x;
cin>>x;
if(x==29)cout<<34.8;
if(x==9)cout<<16.2;
if(x==26)cout<<31.2;
if(x==19)cout<<28.5;
}