B

 1 //c++
 2 #include <cstdio>
 3 #include <cstdlib>
 4 #include <cstring>
 5 #include <iostream>
 6 using namespace std;
 7  
 8 string n;
 9 int a[101];
10  
11 int main()
12 {
13     while (cin>>n)
14     {
15         memset(a,0,sizeof(a));
16         a[0]=n.size();
17         for (int i=1;i<=a[0];i++)
18             a[i]=n[a[0]-i]-'0';
19         for (int j=1;j<=a[0];j++)
20             a[j]=a[j]*6;
21         for (int j=1;j<=a[0];j++)
22         {
23             a[j+1]+=a[j]/10;
24             a[j]=a[j]%10;
25         }
26         while (a[a[0]+1]>0)
27         {
28             a[0]++;
29             a[a[0]+1]+=a[a[0]]/10;
30             a[a[0]]%=10;
31         }
32         a[1]-=3;
33         int k=1;
34         while (a[k]<0 && k<=a[0])
35         {
36             a[k+1]-=1;
37             a[k]+=10;
38             k++;
39         }
40         while (a[a[0]]<=0)
41             a[0]--;
42         for (int i=a[0];i>0;i--)
43             printf("%d",a[i]);
44         printf("\n");
45     }
46     return 0;
47 }
48 
49 
50 // java
51 import java.io.*;  
52 import java.math.BigInteger;  
53 import java.util.*;  
54  
55 public class Main  
56 {  
57     public static void main(String args[])  
58     {  
59         Scanner cin = new Scanner(System.in);     
60         while(cin.hasNext())  
61         {  
62             BigInteger a = cin.nextBigInteger();
63             BigInteger b=BigInteger.valueOf(2);
64             a=a.multiply(b);
65             b=BigInteger.valueOf(1);
66             a=a.subtract(b);
67             b=BigInteger.valueOf(3);
68             a=a.multiply(b);
69             System.out.println(a);
70         }  
71     }  
72 }