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