/**********************************************************
 * Program to find the sum of natural numbers upto n terms
***********************************************************/

#include<stdio.h> // include stdio.h

int main() 
{
    int terms, i;
    unsigned long int sum = 0;

    printf("Enter the number of terms: \n");
    scanf("%d", &terms);

    for(int i = 1 ; i <= terms; i++)
    {
        sum += i;                
    }

    printf("%ld", sum);

    return 0;
}