// sample prelim question (just blanks)

public class rms {

    public static void main(String[] args) {

	TokenReader in = new TokenReader(System.in);

	int n = ______________________________; // # of molecules

	double sum = _________________________; // sum of speeds so far

	double squares = _____________________; // sum of squared speeds so far
	
	int k = ______________________________; // # of speeds already processed
	
	double speed;			        // speed of a molecule

	// Compute sum of speeds and sum of squared speeds
	

	while( _________________________ ) {

	    ______________________________;	 // Read next speed

	    ______________________________;	 // Sum speeds

	    ______________________________;	 // Sum squared speeds

	    ______________________________;	 // Increment # of speeds processed

	}

	// Report if zero molecules, or report percent error of Vrms from Vmean
	
	if ( _______________ ) 

	    System.out.println("No molecules!");

	else {

	    double Vmean = ____________________________________; // mean speed

	    double Vrms = _____________________________________; // rms speed

	    System.out.println("Percent error: " + 

			       __________________________________________________________);
	}
    }
}