#include <cstdio>#include <iostream>#include <algorithm>#include <cstring>#include <cmath>using namespace std;int main() {int n, k;double w;while (~scanf("%d%lf%d", &n, &w, &k)) {n += 2;printf("%.2fn", (n - n / k) * w / 2 + 0.001);}return 0;}
#include <cstdio>#include <iostream>#include <algorithm>#include <cstring>#include <cmath>using namespace std;int main() {int n, k;double w;while (~scanf("%d%lf%d", &n, &w, &k)) {n += 2;printf("%.2fn", (n - n / k) * w / 2 + 0.001);}return 0;}名师互学网 版权所有 (c)2021-2022 ICP备案号：晋ICP备2021003244-6号
