#include<iostream.h>
#include<memory.h>

int record[1000];
int count[1000];
int K;
int keep;
void counter(int array[1000],int dep,int counte)
{
	int i;
	if(counte==count[keep]){
		int sum=4*count[keep];
		int pro=0;
		while(array[pro]==0){pro++;}
		if(sum==dep+1){
			for(i=dep;i>=0;i--){
				cout<<array[i];
			}
			cout<<endl;
		}
		
	   else	if(sum>dep+1){
			cout<<".";
			for(i=1;i<=sum-dep-1;i++){
				cout<<0;
			}
			for(i=dep;i>=pro;i--){
				cout<<array[i];
			}
			cout<<endl;
		}
		else{
			if(sum<=pro){
				for(i=dep;i>=sum;i--){
					cout<<array[i];
				}
				cout<<endl;
			}
			if(sum>pro){
				for(i=dep;i>=sum;i--){
					cout<<array[i];
				}
				cout<<".";
				for(i=sum-1;i>=pro;i--){
					cout<<array[i];
				}
				cout<<endl;
			}
		}
	}
	else{
		int max,m;
		int j;
		int record2[1000];
		memset(record2,0,sizeof(record2));
		for(i=0;i<=K;i++){
			m=i;
			for(j=0;j<=dep;j++){		
				record2[m]=record2[m]+(record[i]*array[j])%10;
				record2[m+1]=record2[m+1]+(record[i]*array[j])/10;
				m++;
			}
		}
		if(record2[m]!=0){max=m;}
		else max=m-1;
		for(i=0;i<=max;i++){
			if(record2[i]>=10){
				record2[i+1]=record2[i+1]+record2[i]/10;
		        record2[i]=record2[i]%10;
			}
		}
		if(record2[max+1]!=0){max=max+1;}
		counter(record2,max,counte+1);
	}
}

void main()
{
    double buttom[1000];
	int total[1000];
	cin>>buttom[0]>>count[0];	
	int i=0;
	while(){
	   cin>>buttom[i+1]>>count[i+1];
	   i++;
	   }
    int k=i;
	for(i=0;i<=k;i++){
	  total[i]=buttom[i]*10000;
	   int j=0;
	   memset(record,0,sizeof(record));
	   while(total[i]>0){
	       record[j]=total[i]%10;
	       total[i]=total[i]/10;
		   j++;
	   }
	   K=j-1;
	   keep=i;
	   counter(record,K,1);
	}
	//cin>>i;
}