#include "stdio.h" #include "math.h" void main() { int a,b; int i,j; long long sum; int count; for(;scanf("%d%d",&a,&b)!=EOF;) { sum=0; for(i=a+1;i<b;i++) { count=0; for(j=2;j<=sqrt(i);j++) { if(i%j==0) { count++; break; } } if(count==0) { sum=sum+i; } } printf("%11d\n",sum); } } |
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