diff --git a/junji/math/6064.cpp b/junji/math/6064.cpp
new file mode 100644
index 0000000..ca81d78
--- /dev/null
+++ b/junji/math/6064.cpp
@@ -0,0 +1,53 @@
+#include <iostream>
+#include <stack>
+#include <queue>
+#include <vector>
+#include <utility>
+#include <algorithm>
+#include <string.h>
+using namespace std;
+
+int T;
+int M, N, x, y;
+
+int gcd(int a, int b)
+{
+	if (a == 0)
+		return (b);
+	return (gcd(b % a, a));
+}
+
+int lcm(int a, int b)
+{
+	return (a / gcd(a, b) * b);
+}
+
+void	get_input()
+{
+	cin >> T;
+	for (int i = 0; i < T; ++i) 
+	{
+		bool is_find = false;
+		cin >> M >> N >> x >> y;
+		int end = lcm(M, N);
+		for (int i = x; i <= end; i += M) 
+		{
+			if (i % N == y || (i % N == 0 && N == y))
+			{
+				cout << i << '\n';
+				is_find = true;
+				break ;
+			}
+		}
+		if (!is_find)
+			cout << "-1\n";
+	}
+}
+
+int main(void)
+{
+	ios::sync_with_stdio(false);
+	cin.tie(NULL);
+
+	get_input();
+}