#include<stdio.h> #include<math.h> int main(){ int begin,end; int t; while(scanf("%d%d",&begin,&end)!=EOF){ if(begin>end){ t=begin; begin=end; end=t; } int isprime=1; long int sum=0; for(int i=begin+1;i<end;i++){ if(i==1){ isprime=0; continue; } int isprime=1; for(int j=2;j<=sqrt(i);j++){ if(i%j==0){ isprime=0; break; } } if(isprime==1){ sum+=i; } } printf("%ld\n",sum); } return 0; } |
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