#include <iostream> #include <cstdio> #include <cmath> using namespace std; int main(){ int a,b,sum,t,flag; while(cin>>a>>b){ sum=0; if(a>b){ t=a; a=b; b=t; } for(int i=a+1;i<b;i++){ flag=1; if(i==1) flag=0; for(int j=2;j<=sqrt(i);j++){ if(i%j==0){ flag=0; break; } } if(flag==1) sum+=i; } cout<<sum<<endl; } return 0; } |
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