import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
    public static void main(String args[]) throws Exception {
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	String strArray[] = br.readLine().split(" ");
	int A, B, C, result;
	A = Integer.parseInt(strArray[0]);
	B = Integer.parseInt(strArray[1]);
	C = Integer.parseInt(strArray[2]);
	result = C - (A - B);
	System.out.println(result >= 0 ? result : 0);

    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz