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