#include<iostream.h>
const NN=1000;
void main(){
	double R;
	int n=0,m=0;
	int l=4;
	int sum[100];
	char r[6];
	int xs=0;
// 输入
	for(int ii=0;ii<6;ii++){
		cin>>r[ii];
		if(r[ii]>='0' &&r[ii]<='9')m=m*10+r[ii]-'0';
		if(r[ii]=='.')xs=ii;
	}
	if(xs>=2)m=m*10;
	cin>>n;

	for(int i=0;i<100;i++)sum[i]=0;
	sum[0]=m%NN;
	sum[1]=m/NN;
	int n1=1,n2=0;
//	int s1=0,s2=0;
	if (sum[n2]==0)n2++;
	if (sum[n1]!=0)n1++;		

	for (i=1;i<n;i++){
		for(int j=0,s1=0,s2=0;j<100;j++){
				s1=sum[j]*m+s2;
				s2=s1/NN;
				sum[j]=s1%NN;
			
		}
	}
	for(n1=99;n1>=0 && sum[n1]==0;n1--);
	l=l*n;
	int out[150];
	int cn=0;
	//n1++;
	if (sum[n1]>=100){out[cn]=sum[n1]/100;cn++;}
	if (sum[n1]>=10){out[cn]=(sum[n1]-sum[n1]/100*100)/10;cn++;}
	out[cn]=sum[n1]%10;
	for (n=n1-1;n>=0;n--){
		out[++cn]=sum[n]/100;
		out[++cn]=(sum[n]-sum[n]/100*100)/10;
		out[++cn]=sum[n]%10;
	}
	for(n2=cn;(cn-l)<n2 && out[n2]==0;n2--);
	//输出
	if(l>cn)cout<<'.';
	for(int count=1	;l>cn+count;count++)cout<<0;
	for(n=0;n<=n2;n++){
		if(l<=cn)if(cn-n+1==l)cout<<'.';
		cout<<out[n];
	}
	cout<<endl;
}