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