#include <stdio.h>

int main() {
	int size;
	printf("Enter pyramid size: ");
	scanf("%d", &size);

	for (int i = 1, increment = 1; ; i += increment) {
		if (i == 0) break;

		for (int i2 = 0; i2 < size - i; i2++) printf(" ");
		for (int i2 = 0; i2 < (2 * i) - 1; i2++) printf("*");
		printf("\n");

		if (i == size) increment = -1;
	}
}