Check fibonacci C

/*program to check a fbonacci number with its position */
#include <stdio.h>

int main() {
    int n, first = 0, second = 1, third = 0, count = 3;

    printf("Enter a number: ");
    scanf("%d", &n);

    if (n == 0)
        printf("Yes, Position 1");
    else if (n == 1)
        printf("Yes, Position 2 and 3");
    else {
        while (third < n) {
            third = first + second;
            if (third == n) {
                printf("Yes, Position %d", count);
                break;
            }
            first = second;
            second = third;
            count++;
        }
        if (third > n)
            printf("No");
    }

    return 0;
}