#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rrep(i, n) for (int i = (int)(n - 1); i >= 0; i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) int(x.size())
#define get_unique(x) x.erase(unique(all(x)), x.end());
typedef long long ll;
typedef complex<double> Complex;
const int INF = 1e9;
const ll MOD = 1e9 + 7;
const ll LINF = 1e18;
template <class T>
bool chmax(T& a, const T& b) {
    if (a < b) {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T& a, const T& b) {
    if (b < a) {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
vector<T> make_vec(size_t a) {
    return vector<T>(a);
}
template <class T, class... Ts>
auto make_vec(size_t a, Ts... ts) {
    return vector<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}
struct modint {
    ll x;
    modint(ll x = 0) : x((x % MOD + MOD) % MOD) {
    }
    ll value() const {
        return x;
    }
    modint operator-() const {
        return modint(-x);
    }
    modint& operator+=(const modint a) {
        if ((x += a.x) >= MOD) x -= MOD;
        return *this;
    }
    modint& operator-=(const modint a) {
        if ((x += MOD - a.x) >= MOD) x -= MOD;
        return *this;
    }
    modint& operator*=(const modint a) {
        (x *= a.x) %= MOD;
        return *this;
    }
    modint operator+(const modint a) const {
        modint res(*this);
        return res += a;
    }
    modint operator-(const modint a) const {
        modint res(*this);
        return res -= a;
    }
    modint operator*(const modint a) const {
        modint res(*this);
        return res *= a;
    }
    modint pow(ll t) const {
        if (t == 0) return 1;
        modint a = pow(t >> 1);
        a *= a;
        if (t % 2 == 1) a *= *this;
        return a;
    }
    modint inv() const {
        return pow(MOD - 2);
    }
    modint& operator/=(const modint a) {
        return (*this) *= a.inv();
    }
    modint operator/(const modint a) const {
        modint res(*this);
        return res /= a;
    }
};
struct combination {
    vector<modint> fact, ifact;
    combination(int n) : fact(n + 1), ifact(n + 1) {
        assert(n < MOD);
        fact[0] = 1;
        for (int i = 1; i <= n; i++) {
            fact[i] = fact[i - 1] * i;
        }
        ifact[n] = fact[n].inv();
        for (int i = n; i >= 1; i--) {
            ifact[i - 1] = ifact[i] * i;
        }
    }
    modint operator()(int n, int k) {
        if (n < k || k < 0) return 0;
        return fact[n] * ifact[k] * ifact[n - k];
    }
    modint h(int n, int k) {
        n += k - 1;
        if (k < 0 || k > n) return 0;
        return fact[n] * ifact[k] * ifact[n - k];
    }
} comb(2002002);
template <typename T>
struct SegmentTree {
    int n;
    vector<T> node;
    T calc(T a, T b) {
        return a + b;
    }
    T e = 0;
    SegmentTree(vector<T> v) {
        int sz = v.size();
        n = 1;
        while (n < sz) {
            n *= 2;
        }
        node.resize(2 * n - 1, e);
        for (int i = 0; i < sz; i++) {
            node[i + n - 1] = v[i];
        }
        for (int i = n - 2; i >= 0; i--) {
            node[i] = calc(node[2 * i + 1], node[2 * i + 2]);
        }
    }
    SegmentTree(T sz) {
        n = 1;
        while (n < sz) {
            n *= 2;
        }
        node.resize(2 * n - 1, e);
    }
    void update(int x, T val) {
        x = n + x - 1;
        node[x] = val;
        while (x > 0) {
            x = (x - 1) / 2;
            node[x] = calc(node[2 * x + 1], node[2 * x + 2]);
        }
    }
    void add(int x, T val) {
        x = n + x - 1;
        node[x] += val;
        while (x > 0) {
            x = (x - 1) / 2;
            node[x] = calc(node[2 * x + 1], node[2 * x + 2]);
        }
    }
    T query(int a, int b, int k = 0, int l = 0, int r = -1) {
        if (r < 0) r = n;
        if (r <= a || b <= l) return e;
        if (a <= l && r <= b) return node[k];
        T vl = query(a, b, 2 * k + 1, l, (l + r) / 2);
        T vr = query(a, b, 2 * k + 2, (l + r) / 2, r);
        return calc(vl, vr);
    }
    T at(int x) {
        return node[n + x - 1];
    }
};
int main() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    vector<ll> b(n), w(n);
    rep(i, n) {
        if (s[i] == '.')
            w[i]++;
        else
            b[i]++;
    }
    SegmentTree<ll> black(b);
    SegmentTree<ll> white(w);
    ll ans = LINF;
    rep(i, n + 1) {
        chmin(ans, black.query(0, i) + white.query(i, n));
    }
    cout << ans << endl;
}

Measured memory_bytes: 44648