#include <stdio.h>

int main(void) {
	int n = 5;
	for (int i = 1; i <= n; i++) {
		/* Step 1: Print leading spaces */
		for (int s = 1; s <= n- i; s++) { 
			printf(" ");
		}
		/* Step 2: Print sequential numbers */ 
		for (int j = 1; j <= i; j++) {
			printf("%d", j);
			}
			printf("\n");
	}
	return 0; 
}