#include <stdio.h>

int main (int argc, const char * argv[]) {
    int x = 1;
	int y = 0;
	int z = 1;
	int power;
	
    printf("Please enter a number: ");
	scanf("%d", &power);
	
	printf("1");
	while (z < power) {
		y = x * 3;
		printf(", %d", y);
		x = y;
		z++;
	}
    return 0;
}