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