#include <stdio.h>
//sur ideone, les entrées sont à écrire dans la zone de texte "input (stdin)
int max(int a,int b)
{
 return a<=b?b:a;
 /*
 équivalent à :
 if(a<=b)return b;
 else return a;
 */
}
int min(int a,int b)
{
 return a<=b?a:b;
}
 
int intersectionPeriode(int dateD1,int dateF1,int dateD2,int dateF2)
{
 return max(dateD1,dateD2) < min(dateF1,dateF2);
 //mettre '<=' si on souhaite que la comparaison (1,2,2,3) sont bonne (par exemple).
}
 
void saisirPeriodeInvite(int *dd,int *df)
{
 printf("periode : ");
 scanf("%d %d",dd,df);
 printf("%d %d\n",*dd,*df);///pour ideone, faire un affichage comme en console.
}
 
 
int main (void)
{
 int debutPeriode,finPeriode;//la periode à étudier
 
 int nbInvite;
 int dateD,dateF;//la periode d'un invité
 
 int nbSuspect=0;
 
 int i;
 scanf("%d %d %d",&debutPeriode,&finPeriode,&nbInvite);
 printf("periode de l'etude :[%d,%d] nombre d'invite :%d\n",debutPeriode,finPeriode,nbInvite);
 for(i=0;i<nbInvite;i++)
 {
  saisirPeriodeInvite(&dateD,&dateF);
  if( intersectionPeriode(debutPeriode,finPeriode,dateD,dateF) )nbSuspect++;
 }
 printf("nombre de suspect :%d\n",nbSuspect);
 return 0;
}

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