#include <stdio.h>
#include <stdlib.h>

void doubleArray(float *arr, int n) {
    for (int i = 0; i < n; i++) {
        (arr + i) = 2 * ((arr + i));
    }
}

int main() {
    int n;
    scanf("%d", &n);

    if (n <= 0) {
        printf("Invalid Input\n");
        return 0;
    }

    float *arr = (float *)malloc(n * sizeof(float));
    if (arr == NULL) {
        // Check if memory allocation failed
        printf("Memory Allocation Failed\n");
        return 0;
    }

    for (int i = 0; i < n; i++) {
        scanf("%f", arr + i);
    }

    doubleArray(arr, n);

    for (int i = 0; i < n; i++) {
        printf("%.2f ", *(arr + i));
    }
    printf("\n");

    free(arr);
    return 0;
}