#include<stdio.h> 

int main()
{
 
int sum=0,n,i=0;
printf("Enter n\n");
scanf("%d",&n);
 
abc :
i++;
sum=sum+i;
 
if(i<n)
{
goto abc;
}
printf("Sum of first %d natural numbers is %d",n,sum);
 
return 0;
}
     
           
Note: Need to be arranged in compiler after copied
   

 OutPut:

Enter n 5 Sum of first 5 natural number is 15