#include <avr/io.h>        
  
  int main(void) 
  {
    
    ddrb = ddrb & 0b11111101;      
    ddrc = ddrc | 0b10000000;      
    
    while(1)
    {
      if (pinb & (0b00000010))    
        portc = portc |0b10000000;  
      else
        portc = portc & 0b01111111;  
    } 
  
    return 0;
  }