C++ :

#include<iostream>
#include<fstream>
#include<cmath>
#include<cstdio>
using namespace std;

double w[100001];
int sum=0;
double H,S1,V,L,K,n;
double nTimefront,nTimeend,nXfront,nXend;
int main(){
//	freopen("freefaller.in","r",stdin);
//	freopen("freefaller.out","w",stdout);
	cin>>H>>S1>>V>>L>>K>>n;
	
	for(int i=0;i<=n-1;++i){
		w[i]=S1-i;
	}
	
	for(int d=n-1;d>=0;--d){
		
		nTimefront=w[d]/V;
		
		nTimeend=(w[d]+L)/V;
		
		nXfront=(nTimefront*nTimefront*10)/2;
		
		nXend=(nTimeend*nTimeend*10)/2;
		
		if(nXfront<=H-K&&nXend>=H-K){
			sum++;
			continue;
		}
		if(nXfront<=H)
		if(H-nXfront<=K+0.00001||H-nXend<=K+0.00001){
			sum++;
			continue;
		}
	}
	if(sum==2||sum==4) {
	cout<<3;
	return 0;}
	cout<<sum;
}