import java.util.Scanner;
import java.text.DecimalFormat;
public class Main {
public static void add(float a,float b,float c){
float sumA = 0;
float sumB = 0;
float sumC = 0;
for(int i=0;i<a;i++){
sumA+=i+1;
}
for(int i=0;i<b;i++){
sumB+=(i+1)*(i+1);
}
DecimalFormat df = new DecimalFormat("#.00");
for(float i=0;i<c;i++){
sumC+=1/(i+1);
}
float sum = sumA+sumB+sumC;
System.out.print(df.format(sum));
}
public static void main(String[] arg){
Scanner sc = new Scanner(System.in);
float a = sc.nextFloat();
float b = sc.nextFloat();
float c = sc.nextFloat();
add(a,b,c);
}
}
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