#include "bits/stdc++.h"
using namespace std;

int main() {
	int n;
	vector<int> vi;
	int data[10005] = { 0 };
	for (int i = 0; i < 10005; ++i) {
		data[i] = i;
	}
	for (int i = 2; i <= sqrt(10005); ++i) {
		for (int j = i * 2; j <= 10005; j = j + i) {
			data[j] = 0;
		}
	}
	for (int i = 2; i <= 10005; ++i) {
		if (data[i])vi.push_back(data[i]);
	}

	while (cin >> n) {
		if(!n)break;
		int sum = 0;
		for (int i = 0; i < n; ++i) {
			sum+=vi[i];
		}
		cout << sum<< endl;
	}
}