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