Summing Consecutive Integers

#include<stdio.h>
int main()
{
    int a,n,sum=0,count=0;
    scanf("%d %d",&a,&n);
    while(1)
    {
        if(n<=0)
            scanf("%d",&n);
        if(n>0)
            break;
        else
            continue;
    }
    while(count!=n)
    {
        sum=sum+a;
        count++;
        a++;
    }
    printf("%d\n",sum);
    return 0;
}