The Drunk Jailer (UVALive 2557, ZOJ 1350, POJ 1218, HDU 1337, Regionals 2002 >> North America - Greater NY)

///     Raihan Ruhin
///     CSE, Jahangirnagar University.
///     Dhaka-Bangladesh.
///     id: raihanruhin (topcoder / codeforces / codechef / uva / uvalive), 3235 (lightoj)
///     mail: raihanruhin@ (yahoo / gmail / facebook)
///     blog: ruhinraihan.blogspot.com

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

#define SET(a) memset(a,-1,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define PI acos(-1.0)

#define MOD 1000000007
#define MX 100010


int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    int tc, kk=1, n, m, x, y, a, b, c, arr[105];
    string s;
    cin>>tc;
    while(tc--)
    {
        cin>>n;
        CLR(arr); //all locked
        int cnt=0;
        for(int i=1;i<=n;i++)
            for(int j=i;j<=n;j+=i)
                arr[j]=1-arr[j]; //toggle
        for(int i=1;i<=n;i++)
            cnt+=arr[i];
        cout<< cnt <<"\n";
    }
return 0;
}