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