#include<stdio.h>
int main(){
    if(scanf("%d",&n)!=1||n<=0){
        printf("Invalid Input");
        return 0;
    }
    float a[n];
    for(int i=0;i<n;i++){
        scanf("%f",&a[i]);
        a[i]=2*a[i];
        printf("%.2f ",a[i]);
    }
}