sumset 더블릿

#include <stdio.h>
 
int dp[1100000] = { 0 };
 
int main() {
    int n;
    scanf("%d", &n);
    getchar();
 
    dp[1] = 1;
    dp[2] = 2;
 
    for (int i = 3; i <= n; i++) {
        if (i % 2 == 1)
            dp[i] = dp[i - 1]%1000000000;
        else
            dp[i] = (dp[i - 1] + dp[i / 2])%1000000000;
    }
 
    printf("%d", dp[n]%1000000000);
}