Circulation sum

Title: seeking SnSn = a + aa + aaa + ... + aaa ... a example: 2 + 22 + 222 + 22222 + 2222 (where n = 5)

#include<stdio.h>
int main()
{
	int a,n,i,s=0,sn=0;
	scanf("%d%d",&a,&n);
	for(i=1;i<=n;i++)
	{
		
		s=s+a;
		sn=sn+s;
		a=10*a;
	}
	printf("%d",sn);
	return 0;
}