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