#include<iostream> #include<math.h> using namespace std; int judge(int a) { int flag=1; double k=sqrt(a); for(int i=2;i<=k;i++) { if(a%i==0) { flag=0; break; } } return flag; } int main() { int a,b,sum; while(cin>>a>>b) { sum=0; for(int i=a+1;i<b;i++) { if(judge(i)) { sum+=i; } } cout<<sum<<endl; } return 0 ; } |
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