#include<cstdio> #include<cmath> #include<algorithm> using namespace std; bool isprime(int a){ if(a==1) return false; for(int i=2;i<=sqrt(a);i++){ if(a%i==0) return false; } return true; } int main(){ unsigned int a,b; while(scanf("%d %d",&a,&b)!=EOF){ long int sum=0; if(a>b) swap(a,b); for(int i=a+1;i<b;i++){ if(isprime(i)) sum+=i; } printf("%ld\n",sum); } return 0; } |
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