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| 1 | #include <iostream> | |
| 2 | ||
| 3 | using namespace std; | |
| 4 | ||
| 5 | int a[2020]; | |
| 6 | ||
| 7 | int main() {
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| 8 | a[1] = 1; | |
| 9 | for (int i = 2; i <= 2019; i++) {
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| 10 | a[i] = a[i / 2] + i % 2; | |
| 11 | } | |
| 12 | int ans = 0; | |
| 13 | for (int i = 1; i <= 2019; i++) {
| |
| 14 | - | if (a[i] == 7) {
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| 14 | + | if (a[i] == 9) {
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| 15 | ans++; | |
| 16 | } | |
| 17 | } | |
| 18 | cout << ans; | |
| 19 | return 0; | |
| 20 | } |
