Codigo C

#include<stdio.h>
#include<conio.h>

main(void)
{
    int s,a,n,i;
        s=0;
    printf("\nA=");
    scanf("%d"&a);

     do {
        printf("\nN= ");
         scanf(n<=0);
     }  while(n<=0);

     for (i=1;i<=n;i++)
        {
            s=s+a;
            a=a+1;
        }

    printf("\nSoma: %d", s);
    getch();


}