diff --git a/ppg.cpp b/ppg.cpp
index 59e70c9..11a6e67 100644
--- a/ppg.cpp
+++ b/ppg.cpp
@@ -115,7 +115,7 @@ int main(){
 			cv::meanStdDev(greenSignal, mean, stddev);
 			for (int l_sample=0; l_sample < FPS*BUFFER_DURATION; l_sample++)
 			{
-				greenSignalNormalized.push_back((greenSignal.at<double>(0, l_sample)-mean[0])/stddev[0])
+				greenSignalNormalized.push_back((greenSignal.at<double>(0, l_sample)-mean[0])/stddev[0]);
 			}
 			//This is used in the main function to display the signal
 			int range[2] = {0, (int)(FPS*BUFFER_DURATION)};
@@ -136,7 +136,23 @@ int main(){
 			}
 			// display green FFT
 			cv::imshow("FFT module green", plotGraph(greenFFTModule, range));
+			
+			std::vector<double> sampleVector{};
+			for (int i=0; i<greenFFTModule.length();++i)
+			{
+				if (greenFFTModule.at(i)>=0.5 && greenFFTModule.at(i)<=4)
+				{
+					sampleVector.push_back(greenFFTModule.at(i));
+				}
+			}
+			std::cout << "values in interval: "<<"\n";
+			for (auto i: sampleVector()) 
+			{
+   				std::cout << i << ' '; // will print vector's content
+			}
+			//get maximum value of sampleVector and print it
+			std::cout<<"max frequency: "<<"\n"<<max_element(sampleVector.begin(cloud), sampleVector.end(cloud));
+			return 0;	
 		}
 	}	
-}
-
+}
\ No newline at end of file