diff --git a/Codeforces/1367B.cpp b/Codeforces/1367B.cpp
new file mode 100644
index 0000000..e907084
--- /dev/null
+++ b/Codeforces/1367B.cpp
@@ -0,0 +1,41 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main()
+{
+	int t;
+	cin>>t;
+	while(t--)
+	{
+		int n,i,j,k;
+		int a[10000];
+		
+		cin>>n;
+		
+		int even=0,odd=0;
+		for(i=0;i<n;i++)
+		{
+			cin>>a[i];
+      
+			if(a[i]%2!=i%2)
+			{
+				if(a[i]%2==0)
+				even++;
+				
+				else
+				odd++;
+				
+				
+			}	
+		}
+		
+		if(even==odd)
+		cout<<even;
+		
+		else
+		cout<<-1;
+		
+	cout<<endl;
+	}
+}