#include <stdio.h> #include <math.h> int main(){ int a,b; int i,j,flag; int sum,temp; 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++){ flag=1; if(i==1) flag=0; else{ for(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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