C :

#include<stdio.h>
int main()
{
	int T,i,t;
	int N[100],M[100];
	scanf("%d",&T);
	while(T--)
	{   i=T;
		scanf("%d %d",&N[i],&M[i]);
		t=N[i];
   	    while(1)
		{
			if(N[i]%M[i]==0)
			{
				t=t+N[i]/M[i];
				N[i]=N[i]/M[i];
			}
			else if(N[i]%M[i]<M[i])
			{
				t+=N[i]/M[i];
				N[i]=N[i]/M[i]+(N[i]%M[i]);
				if(N[i]<M[i])
				{
					break;
				}
				
			}
		}
		printf("%d\n",t);
	}
	  return 0;
}

C++ :

#include <iostream>
#include <cstring>
#include <string>
#include <cmath>
#include <string>
#include <fstream>
using namespace std;
int main()
{
	//ifstream cin;
	//cin.open("a.in");
	//ofstream cout;
	//cout.open("a.out");
    int testcase;
    cin>>testcase;
    while(testcase--)
    {
        long long initial,exnum;
        cin>>initial>>exnum;
        long long count=initial;
        while(initial>=exnum)
        {
            int exchange=initial/exnum;
            count+=exchange;
            initial%=exnum;
            initial+=exchange;
        }
        cout<<count<<endl;
    }
    return 0;
}

Java :

import java.util.Scanner;
class Main {
	public static void main(String[] args) {
		Scanner reader=new Scanner(System.in);
		int T=reader.nextInt();
		for(int i=0;i<T;i++){
			int n=reader.nextInt();
			int m=reader.nextInt();
			if(n<m){
				System.out.println(n);
			}else{
				int sum=n;
				int k=0;
				boolean flag=true;
				while(flag){
					if(n-m>=0){
						n=n-m+1;
						k++;
					}else flag=false;
				}
				sum+=k;	
				System.out.println(sum);
			}
		}
	}

}