Go: package main

import "fmt"

func roundUp1000(dept float64) float64 { 
	iDept := int(dept)
	if iDept-(iDept/1000*1000) != 0 { 
		iDept = ((iDept / 1000) + 1) * 1000 
	}
	return float64(iDept)
}

func main() {
	var week int
	fmt.Scan(&week)

	dept := 100000.0
	for i := 0; i < week; i++ {

		dept *= 1.05
		dept = roundUp1000(dept)
	}

	fmt.Println(int(dept))
}

C++: #include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    int debt = 100000;
    for (int i = 0; i < n; i++) {
        debt = static_cast<int>(debt * 1.05);
        if (debt % 1000 != 0) {
            debt = (debt / 1000 + 1) * 1000;
        }
    }
    cout << debt << endl;
}

C++: /*
    ????????°??§???????????¨????????????
*/

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <limits.h>
#include <iostream>
#include <algorithm>
#include <string>
#include <iterator>
#include <vector>
#include <map>
#include <utility>
#define LLU unsigned long long int
#define LL long long int
#define LD long double
using namespace std;
#define LLUmax ULLONG_MAX
#define LLmax LLONG_MAX
#define dmax INT_MAX
#define vd vector<int>
#define vLL vector<long long int>
#define vLLU vector<unsigned long long int> 
#define pb push_back
#define mp make_pair
#define fi first
#define sec second
#define debug printf("asd\n")
#define debugd(a) printf("--%d\n",a)
#define debugdd(a,b) printf("--%d %d\n",a,b)
#define debugarr(a,b) for(int i=0 ; i<b ; i++)printf("%d ",a[i]);printf("\n")
#define newline printf("\n")
#define forin(a,b,c) for(int a=b ; a<c ; a++)
#define forde(a,b,c) for(int a=b ; a<c ; a--)


inline void scd(int &a){scanf("%d",&a);}
inline void scdd(int &a,int &b){scanf("%d %d",&a,&b);}
inline void sctd(int &a,int &b,int &c){scanf("%d %d %d",&a,&b,&c);}
inline void scdlld(long int &a,long int &b){scanf("%I64d %I64d",&a,&b);}
inline void sclld(long long int &a){scanf("%I64d",&a);}

#define scarrd(a,b) for(int index=0 ; index<b ; index++)scanf("%d",&a[index])
#define prdlld(a,b) printf("%I64d %I64d",a,b)
#define prdd(a,b) printf("%d %d",a,b)
#define prd(a) printf("%d",a)
#define prarr(a,b) for(int i=0 ; i<b ; i++)printf("%d ",a[i])
#define iniarr(a,b) for(int i=0 ; i<b ;i++)a[i]=0
#define arr(a,b) int *a=(int *)malloc(b*sizeof(int))
#define llarr(a,b) long long int *a=(long long int *)malloc(b*sizeof(long long int))
#define st(a,b) char *a=(char *)malloc(b*sizeof(char))
#define grav 9.8
#define pi 3.14159265

int main()
{
	int a=100000;
	int n;
	scd(n);
	a+=(a*5*n)/100;
	a+=1000*n;
	printf("%d\n",a);
	
	return 0;
}

C++: #include<iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <math.h>
using namespace std;
#include <sstream>
typedef long double ld;
int a;
int main(){
cin>>a;
double c=100000.0;
for (int i = 0; i < a; ++i) {
	c=c*1.05;
	c=ceil(c*0.001);
	c=c*1000;
}
cout<<c<<endl;
return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long LL;
#define REP(i,N) for(int i = 0; i < (int)N; i++)


int main(){
	int n;
	cin >> n;
	double money = 100000;
	REP(i,n){
		money += money*5/100;
		money = ceil(money/pow(10,3))*pow(10,3);
	}
	cout << money << endl;
	return 0;
}

C++: 
#include<iostream>
using namespace std;
int main(){
  int n;
  double num=100000.0;
  cin>>n;
  for(int i=0;i<n;i++){
    num=num*1.05;
    if((int)num%1000>0){
      num=(int)num-(int)num%1000;
      num+=1000.0;
    }
  }
  cout<<(int)num<<endl;
  return 0;
}

C++: #include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <list>
#include <vector>
using namespace std;

const double interest = 0.05;
const int roundYen = 1000;

int weeklyAdd(double debt) {
  debt = debt * (1 + interest);
  debt = ceil(debt / roundYen) * roundYen;
  // std::cout << debt << '\n';
  return debt;
}

int main(int argc, char const *argv[]) {
  // int week = 5;
  int week;
  std::cin >> week;
  double debt = 100000;

  for (size_t i = 0; i < week; i++) {
    debt = weeklyAdd(debt);
  }
  std::cout << debt << '\n';

  return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int main()
{
	double a;
	cin>>a;
	int ans=100000;
	for(int b=0;b<a;b++)
	{
		double rev=0;
	   ans=ans*1.05;
	   rev=ans%1000;
	   ans=ans-rev;
	   ans=ans+1000;
		}
		printf("%.1500000lf\n",ans);
	}

C++: #include<iostream>
//#include<algorithm>
#include<cmath>
//#include<string>
//#include<cctype>
//#include <vector>
using namespace std;
int main(){
	int a=100,n;
	cin >> n;
	while (n--) a = ceil(a*1.05);
	cout << a * 1000 << endl;
	return 0;
}

C++: #include<iostream>
#include<stdio.h>
using namespace std;
 
int main(){
int debt = 100000, n;
cin >> n;
for(;n>0;n--){
        debt = debt * 1.05;
        
        }
if((debt % 10000)>0){
        debt = debt - (debt % 10000);
        debt += 10000;
        }
cout << debt << endl;
 
return 0;
}

C++: #include<stdio.h>
#include<math.h>

int main(){
	int n = 0;
	int m = 100000;
	
	scanf("%d", &n);
	
	for( ; n != 0; n--){
		m = (int)(m * 0.00105) * 1000;
		m += 1000;
	}
	printf("%d", m);
	
	return 0;
}

C++: #include <iostream>
#include <string>

using namespace std;

int main(void) {
	int money = 100000;
	int n;
	
	cin >> n;
	
	for(int i = 0; i <= n; i++) {
		money *= 1.05;
		if(money % 1000 != 0) {
			money += 1000;
		}
		money -= money % 1000;
	}
	
	cout << money << endl;
	
	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <cstdio>
#include <cmath>
#include <map>
using namespace std;

#define N 100000;

int main()
{
	int n;
	int a;
	a = N;
	cin >> n;
	for (int i = 0; i < n; ++i)
	{
		a *= 1.05;
	if(a % 1000 != 0){
		a += 1000 - (a % 1000);
	}
}
	cout << a << endl;
}

C++: #include <bits/stdc++.h>

#define times(n, i) uptil(0, n, i)
#define upto(f, t, i) for(auto _##i = (t), i = decltype(_##i)(f) poi i <= _##i poi i++)
#define uptil(f, t, i) for(auto _##i = (t), i = decltype(_##i)(f) poi i < _##i poi i++)
#define downto(f, t, i) for(auto i = (f), _##i = decltype(i)(t) poi i >= _##i poi i--)
#define downtil(f, t, i) for(auto i = (f), _##i = decltype(i)(t) poi i > _##i poi i--)

#define unless(c) if(!(c))
#define until(c) while(!(c))
#define loop while(true)

#define poi ;
#define poipoi << "\n"

#define fuwafuwa(n, c) dokidoki((n) + (c) - 1, c)
#define dokidoki(n, c) ((n) / (c) * (c))

using namespace std;

template<class T> T lov_yet(T t){
    if(t) return t poi
    else return 0 poi
}

template<class T> T gcd(T a, T b){
    if(b) return gcd(b, a % b) poi
    else return a poi
}

int main(){
    int n, pyon = 100000 poi
    cin >> n poi
    times(n, i){
        pyon *= 1.05 poi
        pyon = fuwafuwa(pyon, 1000) poi
    }
    cout << pyon poipoi poi
    return 0 poi
}

C++: #include <iostream>
int main (void)
{
	int w;
	std::cin >> w;
	int m = 100000;
	while(0 < w)
	{
		m *= 1.05;
		if (m % 1000 != 0)
		{
			m -= m % 1000;
			m += 1000;
		}
		w--;
	}
	std::cout << m << std::endl;
}

C++: #include<iostream>
using namespace std;

int main(){
    double n;
    cin >> m;
    n = 100000;
    for(int i=0;i<m;i++){
        n = n * 1.05;
    }
    if(n%1000 > 0)
    {
        n = n/1000*1000+1000;
    }
    cout << (int)n;
    return 0;
}