#include <iostream>

 #include <windows.h>

 using namespace std;

 int main()

 {

     int T;

     cin>>T;

     if(T < )

     {

         cout<<T<<endl;

         return ;

     }

     int x = ;      //扣的钱

     int S = ; //未缴税的工资

     int A = S - ;

     while(true)

     {

         if(A <= )

             x = A * 0.03;

         else if(A <= )

             x =  + (A - ) * 0.1;

         else if(A <= )

             x =  +  + (A - ) * 0.2;

         else if(A <= )

             x =  +  +  + (A - ) * 0.25;

         else if(A <= )

             x =  +  +  +  + (A - ) * 0.3;

         else if(A <= )

             x =  +  +  +  +  + (A - ) * 0.35;

         else

             x =  +  +  +  +  +  + (A - ) * 0.45;

         if(S == x + T)

             break;

         S = S - ;

         A = S - ;

     }

     cout<<S<<endl;

     return ;

 }