HomeWork

#include <stdio.h>
int main() {
    int n, i, sum = 0;

    do {
        printf("Enter: ");
        scanf("%d", &n);
    } while (n <= 0);

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

    printf("Sum = %d", sum);
    return 0;
}