《关于I题玄学AC这档事》
RT
#include <bits/stdc++.h>
using namespace std;
int read() {
char ch = getchar();
int x = 0, pd = 0;
while (ch < '0' || ch > '9') pd |= ch == '-', ch = getchar();
while ('0' <= ch && ch <= '9') x = x * 10 + (ch ^ 48), ch = getchar();
return pd ? -x : x;
}
void f(){
int x = read();
double k = (x + 1) * 1.0 / x;
double ans = pow(k, x);
printf("%.3lf\n", ans);
}
int main() {
f();
return 0;
} 