#include<cstdio> using namespace std; int n,k,p,t,ans,price,num[110],color[200100]; int main() { scanf("%d%d%d",&n,&k,&p); for(int i=1;i<=n;i++) { scanf("%d%d",&color[i],&price); if(price<=p) { for(int j=i;j>t;j--) num[color[j]]++; t=i,ans+=num[color[i]]-1; } else ans+=num[color[i]]; } printf("%d",ans); return 0; }