1 #include <cstdio> 2 3 int n,ans; 4 5 int main(){ 6 scanf("%d",&n); 7 for (int i=1;i<=n;i++) ans+=n/i; 8 printf("%d\n",ans); 9 return 0; 10 }
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原文：http://www.cnblogs.com/registerzxr/p/5081893.html
