C++ :

#include<cstdio>
#include<cstring>
typedef long long int64;
int64 n,k,p;
int64 cnt;
int64 x,y;
int64 c[51][200001], top[51];
int64 total=0;
int64 pi=0;
int64 Sum,prev;

inline void Input(){
	memset(top,-1,sizeof(top));
	scanf("%lld%lld%lld",&n,&k,&p);
	for(int64 i=0;i<n;i++){
	 	scanf("%lld%lld",&x,&y);
	 	int64 t=++top[x];
	 	if(y<=p||pi>0)cnt++;
		c[x][t]=cnt;
		pi=(y<=p)?1:0;
	}
}
inline void Work(){
	for(int64 color=0;color<k;color++){
		prev=c[color][0];
		Sum=0;
		for(int64 i=0;i<=top[color];i++){
			if(c[color][i]-prev>0)Sum=i;
			total+=Sum;
			prev=c[color][i];
		}
	}
}
inline void Output(){
	printf("%lld",total);
}
int main(){
	Input();
	Work();
	Output();
	return 0;
}