求Sn=a+aa+aaa+aaaa+aaaaa的前5项之和

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int n;
	int sum = 0;
	scanf("%d", &n);
	int m = n;
	for(int i=0;i<5;i++)
	{
		sum += n;
		n = (n * 10 + m);
	}
	printf("%d", sum);
	return 0;
}