diff --git a/jiyunpar/math/1978.cpp b/jiyunpar/math/1978.cpp
new file mode 100644
index 0000000..c4eadac
--- /dev/null
+++ b/jiyunpar/math/1978.cpp
@@ -0,0 +1,38 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+int n, ans, flag;
+int	main(void)
+{
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+
+	ans = 0;
+	vector<int> input;
+	input.reserve(100);
+	cin >> n;
+	for (int i = 0; i < n; ++i)
+		cin >> input[i];
+	for (int i = 0; i < n; ++i)
+	{
+		if (input[i] == 1)
+			continue;
+		for (int j = 2; j < input[i]; ++j)
+		{
+			if (input[i] % j == 0)
+			{
+				flag = 1;
+				break;
+			}
+		}
+		if (flag == 0)
+			++ans;
+		if (flag == 1)
+			flag = 0;
+	}
+
+	cout << ans;	
+	return (0);
+}
\ No newline at end of file