BEGIN{
freq[1]=611
freq[2]=955
freq[3]=1306
freq[4]=1443
freq[5]=2973
freq[6]=3056
i=1
}

{
ch3br[i]=$1
i++
}

END{
i = 1
if (i <= 6){
	sum = sum + (freq[i] - ch3br[i])**2
  }
printf("%3.1f \n", sqrt(sum))
}