#include <stdio.h> int main(){ int a,b,c[1000],i,j,sum,k; while(~scanf("%d %d",&a,&b)){ sum=0; for(i=a+1;i<b;i++){ k=0; for(j=2;j<i;j++){ if(i%j==0) k++; } if(k==0) sum+=i; } printf("%d\n",sum); } }
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