/* RE/WA expected */
#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}

int main() {
	int n = ri();
	int a[n];
	int num_sum[200001] = { 0 };
	for (int i = 0; i < n; i++) a[i] = ri(), num_sum[a[i]]++;
	int64_t sum = std::accumulate(a, a + n, 0LL);
	for (int i = 0; i < 200000; i++) num_sum[i + 1] += num_sum[i];
	
	int64_t cache[400];
	for (int i = 0; i < 400; i++) cache[i] = -1;
	int64_t res = 0;
	for (int i = 0; i < n; i++) {
		if (a[i] < 400) {
			if (cache[a[i]] == -1) {
				cache[a[i]] = 0;
				for (int j = 0; j < n; j++) cache[a[i]] += a[j] % a[i];
			}
			res += cache[a[i]];
		} else {
			res += sum;
			for (int j = 0; j <= 200000 / a[i]; j++) {
				int num = num_sum[(j + 1) * a[i] - 1];
				if (j) num -= num_sum[j * a[i] - 1];
				res -= (int64_t) a[i] * j * num;
			}
		}
	}
	std::cout << res << std::endl;
	
    return 0;
}