#include<stdio.h> #include<cmath> #include<cstdlib> #include<cmath> #include<iostream> #include<algorithm> using namespace std; bool isPrime(int m){ for(int i=2;i<=sqrt(m);i++){ if(m%i==0){ return false; break; } } return true; } int main(){ int a,b; while(scanf("%d%d",&a,&b)==2){ if(a>b){ int temp=a; a=b; b=temp; } int sum=0; for(int i=a+1;i<b;i++){ if(isPrime(i)){ sum+=i; } } printf("%d\n",sum); } return 0; } |
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