#include<iostream> using namespace std; int main(){ int n,k,s=0; cin>>n; double a[111111],b[111111],c[111111]; for(int i = 1;i <= n;i++){ cin>>a[i]>>b[i]; c[i]=b[i]/a[i]; } cin>>k; for(int i = 1;i <= n;i++){ if(c[i]>=k)s++; } cout<<s; }