#include <bits/stdc++.h>




namespace zawa {

using i16 = std::int16_t;
using i32 = std::int32_t;
using i64 = std::int64_t;
using i128 = __int128_t;

using u8 = std::uint8_t;
using u16 = std::uint16_t;
using u32 = std::uint32_t;
using u64 = std::uint64_t;

using usize = std::size_t;

} // namespace zawa


namespace zawa {

void SetFastIO() {
    std::cin.tie(nullptr)->sync_with_stdio(false);
}

void SetPrecision(u32 dig) {
    std::cout << std::fixed << std::setprecision(dig);
}

} // namespace zawa
using namespace zawa;

int main() {
    SetFastIO();

    int n, m; std::cin >> n >> m;
    std::vector<std::vector<int>> g(n);
    for (int _{} ; _ < m ; _++) {
        int u, v; std::cin >> u >> v;
        u--; v--;
        g[u].emplace_back(v);
        g[v].emplace_back(u);
    }
    std::vector<int> col(n, -1);
    auto rec{[&](auto rec, int v, int c) -> bool {
        col[v] = c;
        for (auto x : g[v]) {
            if (col[x] == c) return false;
            if (col[x] == -1 and !rec(rec, x, 1 ^ c)) return false;
        }
        return true;
    }};
    bool ans{true};
    for (int i{} ; i < n ; i++) {
        if (col[i] == -1) ans &= rec(rec, i, 0);
    }
    std::cout << (ans ? "Yes" : "No") << '\n';
}