#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  int m[20],i=0,j=0,x=1;
  printf("Input massive M:\n");
  for(i=0; i<=19;i++)
  {
    printf("M[%d]=",i);
    scanf("%d",&m[i]);         
  }
  printf("\n");
  for(i=0;i<=19;i++)
  {
   if(m[i]<1 || m[i]>20)
   {
     x=0;
     break;
   }
   else  
   {  
      for(j=0;j<=19;j++)
      {
        if (m[i]==m[j])
        {
          x=0;
          break;              
        }
      } 
      if (m[i]==m[j]) break;  
   }         
  } 
  if (x=0) printf("Elements of massive M are not 1...20\n");
  else if(x=1) printf("Elements of massive M are 1...20\n"); 
  
  system("PAUSE");	
  return 0;
}