#include<stdio.h> #include<math.h> int main() { int a,b,temp,flag; while(scanf("%d %d",&a,&b)!=EOF) { getchar(); int sum=0; if(a>b) { temp=a; a=b; b=temp; } for(int i=a+1;i<b;i++) { if(i==2)sum+=i; if(i==1)continue; flag=1; for(int j=2;j<=sqrt(i);j++) { if(i%j==0){flag=0;break;} } if(flag==1)sum+=i; } printf("%d\n",sum); } return 0; } |
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