import java.io.*;
class Input {
static BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
static String line;
static String readString(){
line="";
try{
line=br.readLine();
}catch (IOException ex){};
return line;}
static int readInt(){
int n=0;
try{
n=Integer.parseInt(br.readLine());
}catch (IOException ex){};
return n;
}
static float readFloat(){
float f=0;
try{
f=Float.parseFloat(br.readLine());
}catch (IOException ex){};
return f;}
}
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