真~随笔 洛谷P6581 远大目标

//AC代码
#include<iostream>
#include<cmath>
using namespace std;
unsigned long long ans;
long long s;
int main()
{
    cin>>s;
    ans=s*2-1;
    if(s>0)
    {
        cout<<ans;
    }
    else 
    cout<<0;
    return 0;
}
//针没了QwQ

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