#include<stdio.h>
int gcd(int a, int b) {
	
	if (b == 0) return a;
	else return gcd(b, a % b);

}
int main() {
	
	int n = 0;
	while (scanf("%d", &n) != EOF) {
		int s[605];
		for (int i = 0; i < n; i++) {
			scanf("%d", &s[i]);
		}
		int cnt = 0;
		for (int i = 0; i < n; i++) {
			for (int j = i + 1; j < n; j++) {
				if (gcd(s[i], s[j]) == 1)
				{
					cnt++;
				}
			}
		}
		printf("%d\n", cnt);
	}
	

	return 0;
}