void main()
 {cmcon=7;
 trisd=1;trisb=0;portb=0;
 while(1)
         {
          if(portd.f0==0)
                         {
                          portb=1;
                          delay_ms(1000);
                          if(portd.f0==0){portb=3;delay_ms(1000);
                                           if(portd.f0==0){
                                                           portb=7;delay_ms(1000);
                                                            while(portd.f0==0){}  //while button is pressed dont work anything
                                                            portb=5;delay_ms(1000);//turn off led No 2 & waite 1 sec
                                                            portb=4;delay_ms(1000); //turn off led No 1 & waite 1 sec
                                                            portb=0;                //turn off led No 3 & waite 1 sec
                                                          }
                                            else {portb=1;              //else turn off led No 2
                                                  delay_ms(1000);       //waite 1 sec
                                                  portb=0;              //turn off led No 1
                                                  }
                                          }
                          else portb=0;        //else turn off led No 1
                          }

          
         }

}