#include <stdio.h>
#include <math.h>
int main(){
int m,n;
double s=0.0;
if (scanf("%d",&m)!=EOF && scanf("%d",&n)!=EOF && m<=n){
for (int i=m;i<=n;i++){
s+=(i*i+1.0/i);
}
printf("sum = %.6f",s);
}else{
printf("intput m n wrong");
}
return 0;
}
京公网安备 11010702002337 号