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贴代码,28行。#include<iostream>
using namespace std;
int main()
{
int n,ans,i;
while(cin>>n&&n)
{
if(n==1)
{
cout<<0<<endl;
continue;
}
ans=n;
for(i=2;i*i<=n;++i)
if(n%i==0)
{
ans-=ans/i;
while(n%i==0)
n/=i;
}
if(n!=1)
ans-=ans/n;
cout<<ans<<endl;
}
return 0;
}
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