Atcoder beginner 147 pD

#include <bits/stdc++.h>
using namespace std;

#define MOD 1000000007

int main(){
    long long n, a[70], ans;
    unsigned long long ipt;
    bitset<60> bt;

    ans = 0;
    memset(a, 0, sizeof(a));

    cin>>n;
    for(int i=0;i<n;i++){
        cin>>ipt;
        bt = ipt;
        for(int j=0;j<60;j++)
            a[j] += bt[j];
    }

    long long k = 1;
    for(int i=0;i<60;i++){
        ans += ((n - a[i]) * a[i] % MOD) * (k % MOD);
        ans %= MOD;
        k <<= 1;
    }
    cout<<ans<<'\n';
}