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