#include<stdio.h>
#define HOMEWORK[1000000]
int main(){
  int N,M,A[i];
  scanf("%d\n",&N);
  scanf("%d\n",&M);
  for(i=1,i<M+1,i++){
    homeworktime=A[i];
  }
  answer=N-homeworktime;
  printf("/d\n",answer);
  
  return 0
}
  
  