Sn=a+aa+aaa+aaaa+aaaaa的前五项之和

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
int main() {
	int tmp=0, sum=0;
	int i;
	int n;
	scanf("%d", &n);
	for (i = 0; i < 5; i++) {
		tmp = tmp * 10 + n;
		sum += tmp;
	}
	printf("%d\n", sum);
	system("pause");
	return 0;
}