Sum of N numbers which are divisible by 5

Sum of N numbers which are divisible by 5 #include<stdio.h>
int main() {
int a,sum=0,i=1;
scanf("%d",&a);
while(i<=a)
{
if(i%5==0)
{
sum=sum+i;
}
i++;
}
printf("%d",sum);
return 0;
} Output: Enter Number:100                                                                                                       1050