7.perfect not perfect number

#include<stdio.h>
int main () {
int i,n,sum=0;
scanf("%d",&n);
for(i=1;i<n;i++)
{
    if(n%i==0)
        sum+=i;
}
if (sum==n)
    printf("%d is a perfect number",n);
else

printf(" %d isnot a perfect number",n);
main();
return 0;
}