C :

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>
#include<math.h>
//x空瓶子 
int f(int x){
	if(x<2) return 0;
	else return f(x/2+x%2)+x/2; 
}
int main(){
	int n,m;
	scanf("%d%d",&n,&m); 
	printf("%d",f(m/n)+m/n);
	return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;
 
//x个瓶子换饮料 
int fun(int x){
    if(x >= 2){
        return x / 2 + fun(x / 2 + x % 2);
    } else{
        return 0;
    }
}
 
int main(){
    int n,m;
    cin>>n>>m;
    //直接买到的数量+换的数量 
    cout<<m/n+fun(m/n)<<endl;
     
    return 0;
}

Pascal :

var n,m,a,x:longint;
begin
read(n,m);
a:=m div n;
x:=a;
while a>=2 do
begin
x:=x+(a div 2);
if a mod 2=0 then a:=a div 2
else a:=(a-1) div 2+1;
end;
write(x);
end.

Java :

import java.util.Scanner;

public class Main {
	
      public static int Buycoke(int p) {
    	  if(p==1) {
    		  return 1;
    	  }else { 
    		  if(p%2==0) {
    			  return p+Buycoke(p/2);
    		  }else {
    			  return p+Buycoke(p/2)+1;
    		  } 
    	  }
      }
	public static void main(String[] args) {
	   Scanner sc=new Scanner(System.in);
	   int n=sc.nextInt();
	   int m=sc.nextInt();
	   int t=Buycoke(m/n);
	   System.out.println(t);
	}

}