**
L1-017 到底有多二 (15 分)
**
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner (System.in);
String str =sc.nextLine();
double a=1;
double b=0;
int c=1;
int len =str.length();
if(str.substring(0,1).equals("-")) {
a= 1.5;
len--;
}
for(int i=0;i<str.length();i++) {
if(str.substring(i,i+1).equals("2")) {
b++;
}
}
if(Integer.parseInt((str.substring(str.length()-1)))%2==0) {
c=2;
}
double end =b/len*a*c*100;
System.out.printf("%.2f",end);
System.out.println("%");
}
}