#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