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