/*
（1）如果是奇数：
dp[i] = dp[i-1]
相当于在(i-1)每个分隔的前面添了一个1
（2）如果是偶数：
dp[i] = dp[i-1] + dp[i/2]
相当于在(i-1)每个分隔的前面添了一个1，同时(i/2)的每个分隔乘以2
eg：
2：
1 1
2
3：
1 1 1
1 2
4:
1 1 1 1
1 1 2
2 2
4
*/
1 #include <iostream>
2 #include <fstream>
3 #include <sstream>
4 #include <cstdlib>
5 #include <cstdio>
6 #include <cstddef>
7 #include <iterator>
8 #include <algorithm>
9 #include <string>
10 #include <locale>
11 #include <cmath>
12 #include <vector>
13 #include <cstring>
14 #include <map>
15 #include <utility>
16 #include <queue>
17 #include <stack>
18 #include <set>
19 #include <functional>
20 using namespace std;
21 typedef pair<int, int> PII;
22 typedef long long int64;
23 const int INF = 0x3f3f3f3f;
24 const int modPrime = 3046721;
25 const double eps = 1e-9;
26 const int MaxN = 1000010;
27 const int MaxM = 30;
28 const int Mod = 1000000000;
29 const char Opt[4] = { '+', '-', '*', '/' };
30
31
32 int dp[MaxN];
33
34 void Solve(int n)
35 {
36 dp[0] = 0;
37 dp[1] = 1;
38 for (int i = 2; i < n; ++i)
39 {
40 if (i & 1)
41 {
42 dp[i] = dp[i - 1];
43 }
44 else
45 {
46 dp[i] = (dp[i - 1] + dp[i / 2]) % Mod;
47 }
48 }
49 }
50
51
52 int main()
53 {
54 #ifdef HOME
55 freopen("in", "r", stdin);
56 //freopen("out", "w", stdout);
57 #endif
58
59 Solve(MaxN);
60 int n;
61 while (cin >> n)
62 {
63 if (n > 1000000 || n < 0)
64 {
65 cout << -1 << endl;
66 continue;
67 }
68 cout << dp[n] << endl;
69 }
70
71 #ifdef HOME
72 cerr << "Time elapsed: " << clock() / CLOCKS_PER_SEC << " ms" << endl;
73 _CrtDumpMemoryLeaks();
74 #endif
75 return 0;
76 }