#include <iostream>
#include <string>
//#include <fstream>
using namespace std;
int main(){
	//ifstream cin("aaa.txt");
	string s;
	int n;
	while(cin>>s>>n){
		while(s.length() != 6)	s = "0"+s;
		//cout<<s<<"   "<<n<<endl;
		int i,j,k,tag=5;
		for(i=0;i<6;i++)
			if(s[i]=='.'){	tag=i;	s.erase(i,1);	break;	}
		if(i==6)	s.erase(0,1);

		string x(200,'0'),y,yy(200,'0');
		for(i=0;i<=4;i++)	x[195+i]=s[i];
		for(i=1;i<n;i++){//相乘n次
			y=yy;
			for(k=4;k>=0;k--){//相乘5位
				int carr=0,d,ii = 199 - (4-k);
				for(j=199;j>=50;j--){//每一位相乘
					d=(s[k]-'0')*(x[j]-'0')+carr+(y[ii]-'0');
					carr=d/10;
					y[ii--]=char(d%10 + '0');
				}
				y[ii]=carr+'0';
			}
			x=y;
		}
		y.insert(200-(5-tag)*n,1,'.');//添加小数点
		while(y[0]=='0')			y.erase(0,1);			//去掉前导0
		while(y[y.length()-1]=='0')	y.erase(y.length()-1,1);//去掉后面0
		if(y[y.length()-1]=='.')	y.erase(y.length()-1,1);//去掉后面小数点.
		cout<<y<<endl;
	}
	return 0;
}

为啥Runtime Error？？？？