Go: package main

import (
        "fmt"
        "math"
)

func main() {
        var v, t, h float64
        for {
                _, err := fmt.Scanf("%f", &v)
                if err != nil {
                        break
                }
                t = v / 9.8
                h = 4.9 * t * t
                n := math.Floor(h/5+1.0) + 1.0
                fmt.Printf("%d\n", int(n))
        }
}

C++: #include <iostream>
using namespace std;
int main() {
	double v;
	while(cin >> v && v){
		double t;
		int h;
		t = v/9.8;
		for(int i=0; ; ++i){
			if(4.9*t*t <= 5*i-5){
				h = i;
				break;
			}
		}
		cout << h << endl;
	}
}

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

int main(){
	double v, t, y, h;
	while( cin >> v ){
		t = v / 9.8;
		y = 4.9 * t * t;
		for( h=1; y>5*h-5; h++ );
		cout << h << endl;
	}
	return 0;
}

C++: #include<bits/stdc++.h>
#define rep(i,n)for(ll i=0;i<n;i++)
using namespace std;
typedef long long ll;

int main() {
	double d;
	while (cin >> d) {
		for (int i = 1;; i++) {
			double y = sqrt(5.*(i - 1) / 4.9);
			if (9.8*y >= d) { cout << i << endl; break; }
		}
	}
	return 0;
}

C++: #include <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>

using namespace std;

int main(){
    double in,ans;
    
    while(scanf("%lf",&in)!=EOF){
        ans=pow(in/9.8,2)*4.9/5+1;
        printf("%.0lf\n",ans);
    }
    
    return 0;
}

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

#define floor(x) (x*5-5)

double t;

int   main()
{
	while (cin >> t)
	{
		double s;
		s = t * t / (2 * 9.8);
		
		s=(s + 5) / 5;
		s += 0.9;
		cout << int(s) << endl;
	}
	return 0;
}

C++: #include<iostream>
using namespace std;
int main()
{
long double v,n;
int N;
while(cin>>v)
{
n=(4.9*((v/9.8)*(v/9.8)))/5+1;
N=n*1000000;	
if(N%1000000==0)
{
	cout<<N/1000000<<endl;
}
else if(N%1000000!=0)
{
	cout<<N/1000000+1<<endl;
}
}
return 0;
}
//t=v/9.8 y=4.9*t*t N=y/5+1

C++: #include<iostream>
#include<string>
using namespace std;
int main(){
	double n;
	while(scanf("%lf",&n)!=EOF){
	for(int i=1;i<=10009;i++){
	int y=i*5-5;
	double t=sqrt((double)y/4.9);
	if(t*9.8>=n){cout<<i<<endl;break;}
	}
	}
	return 0;
}

C++: #include <iostream>
#include <string>
using namespace std;
int main(){
    double x;
	while(cin>>x){
	int i=1;
	while(true){
		if(i>1+x*x/98)
			break;
		i++;
	}
	cout<<i<<endl;
	}
	return 0;
}

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

int main(void)
{
  double y, v, t;
  double N;
  
  while(cin >> v) {
    t = v / 9.8;
    y = 4.9 * t * t;
    
    N =  y / 5 + 1 + 0.5;

    printf("%.0f\n", N);
  }
  return 0;
}

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

int main(){
  double v, time, y, height;

  while(scanf("%lf", &v) != EOF){
    time = v / 9.8;
    y = 4.9 * time * time;
    height = (y + 5) / 5;

    if(height > int(height)){
      height = int(height) + 1;
    }

    printf("%d\n", int(height));
  }

  return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
#include<map>
#include<set>
#include<utility>
#include<vector>
#include<cmath>
#include<cstring>
#include<cstdio>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define rp(a) while(a--)
#define pb push_back
#define mp make_pair
#define all(in) in.begin(),in.end()
const double PI=acos(-1);
const double EPS=1e-10;
using namespace std;
typedef long long ll;
typedef vector<int> vi;
int main(){
	double n;
	while(cin>>n){
		double t=n/9.8;
		double y=t*t*4.9;
		int ans=1;
		while(5*ans-5<y)ans++;
		cout<<ans<<endl;
	}
}

C++: #include <iostream>
using namespace std;
int LeastHeight(int v) {
  double y, t;
  int N;
  t = v / 9.8;
  y = 4.9 * t * t;
  N = int((y + 5) / 5 + 1);
  return N;
}
int main() {
  double v;
  while(cin >> v) {
	cout << LeastHeight(v) << endl;
  }

  return 0;
}

C++: #include <stdio.h>
int main() {double h;while (scanf("%lf",&h)!=EOF) printf("%d\n",(int)((((h*h*4.9/9.8)/9.8+5.0)/5.0)+0.5+1e-9)); return 0;}

C++: #include <iostream>
#include <iomanip>
#include <math.h>
#include <utility>
#include <vector>
#include <cstdlib>
#include <algorithm>
#include <climits>
using namespace std;

int main(){
	double x;
	while(cin>>x){
		double h = (5+4.9*x/9.8*x/9.8)/5;
		int y=0;
		while(y<h) y++;
		cout << y << endl;
	}
	return 0;
}

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

using namespace std;

int main() {

    int floor;
    double t, y, speed;

    while(cin >> speed) {

        t = speed / 9.8;
        y = 4.9 * t * t;

        for(floor = 1; (double)5 * floor - 5 < y; floor++);

        cout << floor << endl;

    }

}

C++: #include <iostream>
#define G 9.8
using namespace std;

int main()
{
  double v;
  while(cin >> v){
    int y = v * v / (2 * G);
    cout << (y + 5) / 5 + 1 << endl;
  }
}

C++: #include<iostream>
using namespace std;
int main(){
int i,n;
double v,y;
while(cin>>v){
cout<<int(v*v/98+2)<<endl;
}
return 0;
}

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

using namespace std;

int main(){
	double v,t,y,N;
	int n;
	
	while(scanf("%lf",&v)!=EOF){
		t = v/9.8;
		y = 4.9*t*t;
		N = (y+5)/5;
		n = (int)N;
		if(n==N)
		printf("%d\n",n);
		else
		printf("%d\n",n+1);
	}
}

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

int main(void){
    double v;
    double h;
    double N;
    while(cin>>v){
        h=v*v/(2*9.8);
        N=h/5+1;
        cout<<ceil(N)<<endl;
    }
    return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int main(){
double n;
while(scanf("%lf",&n)!=EOF){
n=n/9.8;
n=n*n*4.9;
int i;
for(i=1;i*5-5<n;i++);
cout<<i<<endl;
}
return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

int main() {
  double v;
  while (cin >> v) {
    double t = v / 9.8;
    double n = (4.9 * t * t + 5) / 5;
    cout << ceil(n) << "\n";
  }
}

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


int main()
{
	double s;
	while (cin >> s){
		for (int i = 1;; i++){
			double h = 5 * i - 5;
			double v = sqrt(2 * 9.8 * h);
			if (v >= s){
				cout << i << endl;
				break;
			}
		}
	}
	return 0;
}

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

using namespace std;

int main()
{
	double v;

	while (cin >> v)
	{
		cout << static_cast<int>((4.9 * pow(v / 9.8, 2) + 10 - 1e-7) / 5) << endl;
	}

	return 0;
}

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

int main(void){

    
    double ans,v,t,y;
    
    while(cin >> v){

        t = v / 9.8;
        y = t * t * 4.9;
        ans = y / 5 + 1;
        cout << (int)(ans+1) << endl; 
    }
    return 0;
}

C++: #include <stdio.h>

int main(void){
	double N;
	double v;
	while(scanf("%lf",&v)){
		//1/2*v^2=g*5(N-1)
		//??????????????§?????????????????¨?????????????????????
		N=v*v/(10.0*9.8)+1.0;
		printf("%d\n",(int)(N) + 1);
	}
	return 0;
}

C++: #include<cstdio>
#include<cmath>
#include<iostream>
#include<algorithm>
#define PI 3.1415926535897932384626433
using namespace std;
int main(){
    double a;
    while(cin>>a){
        a=a*a/19.6;
        cout<<(int)a/5+2<<endl;
    }
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i=0; i<(n); ++i)

int main(void){
    double v;
    while(cin >> v) {
        for(int n=1; ; ++n) {
            double t = sqrt((5*n-5)/4.9);
            if(9.8*t > v) {
                cout << n << endl;
                break;
            }
        }
    }
}

C++: #include <stdio.h>

main()
{
  long double v,floar;
  int    i=0;

  while( scanf("%Lf",&v)!=EOF || i<50){
    floar = (v*v/98) + 2;
    //  if((floar-(int)floar) != 0){
    //floar+=1;
    //}
    printf("%d\n", (int)floar);
    i++;
  }

  return 0;
}

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

int main(){
	int n;
	while(cin >> n){
		n = n*n/98+2;
		cout << n <<"\n";
	}
	return 0;
}