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#include<bits/stdc++.h>
#include<message.h>
#include<teatr.h>
#define lim 1000009
#define pot 1048576

using namespace std;

int n,t[pot*2+9];

int main()
{
    int Instance = MyNodeId();
    n = GetN();
    int Nd = NumberOfNodes();
    int ml = n/Nd*Instance;
    int mp = n/Nd*(Instance+1);
    if(Instance==Nd-1)
    {
        mp = n;
    }
    for(int i = 0;i<ml;++i)
    {
        ++t[pot+GetElement(i)];
    }
    for(int i = pot-1;i>0;--i)
    {
        t[i] = t[i*2]+t[i*2+1];
    }
    long long w = 0;
    for(int ii = ml;ii<mp;++ii)
    {
        int k = GetElement(ii);
        int i = pot+k+1;
        int j = pot*2-1;
        int s = 0;
        while(i<j)
        {
            if(i&1)
            {
                s += t[i];
                ++i;
            }
            j >>= 1;
            i >>= 1;
        }
        if(i==j)
        {
            s += t[j];
        }
        w += s;
        i = pot+k;
        while(i>0)
        {
            ++t[i];
            i >>= 1;
        }
    }
    if(Instance==Nd-1)
    {
        for(int i = 0;i<Nd-1;++i)
        {
            Receive(i);
            w += GetLL(i);
        }
        printf("%lld\n", w);
        return 0;
    }
    else
    {
        PutLL(Nd-1,w);
        Send(Nd-1);
    }
}