#include <cstdio>
const int M = 5005;
#define int long long
#define db double
int read()
{
	int x=0,f=1;char c;
	while((c=getchar())<'0' || c>'9') {if(c=='-') f=-1;}
	while(c>='0' && c<='9') {x=(x<<3)+(x<<1)+(c^48);c=getchar();}
	return x*f;
}
int n,m,k;db b[M],c[M],s,ans;
signed main()
{
	n=read();m=read();s=read();
	for(int i=1;i<=n;i++)
	{
		int x=read();
		b[++k]=x;c[k]=1;
		while(k>1 && b[k]*c[k-1]<=b[k-1]*c[k])
		{
			b[k-1]+=b[k];
			c[k-1]+=c[k];
			k--;
		}
	}
	for(int i=k;i>=1;i--)
	{
		if(m*c[i]<=s)
		{
			ans+=b[i]*m;
			s-=m*c[i];
		}
		else
		{
			ans+=b[i]*(s/c[i]);
			break;
		}
	}
	printf("%.8f\n",ans);
}