Sum of natural number

// C Program to Calculate the Sum of Natural Numbers
#include<stdio.h>
int main(){

int sum=0,i,n;
 printf("Enter Integer Value :");
 scanf("%d",&n);
 for(i=1;i<=n;i++){
    sum+=i;

 }
printf("Sum of first %d number is %d\n",n,sum);
return 0;
}