diff --git a/src/week5/BOJ1644/BOJ1644_V1.cpp b/src/week5/BOJ1644/BOJ1644_V1.cpp
new file mode 100644
index 0000000..d2b8aec
--- /dev/null
+++ b/src/week5/BOJ1644/BOJ1644_V1.cpp
@@ -0,0 +1,43 @@
+#include <bits/stdc++.h>
+using namespace std;
+bool a[4000001];
+int arr[200001];
+int p=0;
+int main() {
+
+    ios_base::sync_with_stdio(false);
+    cin.tie(nullptr);
+    cout.tie(nullptr);
+
+
+    int n;
+    cin >> n;
+
+    for (int i=2; i<=n; i++) {
+        if (a[i]) continue;
+        for (int j=2*i; j<=n; j+=i) {
+            a[j] = true;
+        }
+    }
+
+    for (int i=2; i<=n; i++) {
+        if (!a[i]) arr[p++] = i;
+    }
+
+    int ret = 0;
+    int sum = 0;
+    int st = 0, ed = 0;
+    while(true) {
+        if (sum >= n) {
+            if (sum == n) ret++;
+            sum -= arr[st++];
+        } else {
+            if (ed == p) break;
+            sum += arr[ed++];
+        }
+    }
+
+    cout << ret << '\n';
+
+    return 0;
+}
\ No newline at end of file