#include<iostream> using namespace std; #include<cmath> int main() { int n; double H,S1,V,L,K; int a; cin>>H>>S1>>V>>L>>K>>n; double t1=sqrt(H/5); double t2=sqrt((H-K)/5); for(int i=0;i<n;i++) { if((i>=S1-V*t1-0.00001)&&(i<=S1-V*t2+L+0.00001)) { a++; } }cout<<a; }