#include<iostream>
#include<cmath>
using namespace std;

int main(void)
{
    int x,i,j,flat=0,s=0;
    for (x=100;x<=200;x++)
    {
        s+=x;
    j=(int)sqrt(x);
        flat=x;
        for (i=2;i<=j; i++)
        {
            if(x%i==0)
            {
            cout<<"非素数x="<<flat<<endl;
            s-=flat;
            break;
            }
        
        }

   
    }
    cout<<"素数和为："<<s<<endl;
    return 0;
}

#include<iostream>
#include<cmath>
using namespace std;

int main(void)
{
int x,i,j,s=0;
for (x=100;x<=200;x++)
{j=(int)sqrt(x);for (i=2;i<=j;i++)if(x%i==0)break; if(i>j)s+=x;}
cout<<s<<endl;
return 0;
}