diff --git a/a4/Makefile b/a4/Makefile
new file mode 100644
index 0000000..f78f641
--- /dev/null
+++ b/a4/Makefile
@@ -0,0 +1,11 @@
+# variables
+CC=gcc
+CFLAGS=-std=c11 -Wall -Werror
+LDLIBS=-lm
+OUTPUT=$@
+
+# targets
+%: %.c
+	$(CC) $(CFLAGS) $@.c $(LDLIBS) -o $(OUTPUT)
+
+
diff --git a/a4/program b/a4/program
new file mode 100755
index 0000000..aac2250
Binary files /dev/null and b/a4/program differ
diff --git a/a4/program.c b/a4/program.c
new file mode 100644
index 0000000..615b865
--- /dev/null
+++ b/a4/program.c
@@ -0,0 +1,77 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdbool.h>
+#define SIZE 100
+
+bool jeKopa(int i, int inputNum[SIZE]);
+
+int main(){
+    char stringNum[100];
+    int inputNum[100], i = 0;
+    while (1)
+    {
+        //scanf("%s",&stringNum);
+        fgets(stringNum,SIZE,stdin);
+        stringNum[strlen(stringNum)-1] = '\0';
+        if (!isdigit(stringNum[0]))
+        {
+            break;
+        }
+        inputNum[i] = atoi(stringNum);
+        i++;        
+    }
+    for (int j = (i-1)/2; j >= 0; j--)
+    {
+
+    }
+    int vypis[100];
+    if(jeKopa(i,inputNum)){
+        printf("Je to taka kopa:");
+        //int temp = 0, count = 0;
+        
+        vypis[0] = 0;
+        for (int j = 0; j+1 < i; j++)
+        {
+            if (2*j+1 >= i)
+            {
+                break;
+            }
+            vypis[j+1] = 2*j+1;
+            vypis[i-(j+1)] = 2*j+2;
+        }
+        if (i%2==0)
+        {
+            vypis[i/2] = inputNum[i-1];
+        }
+           
+    }
+    printf("\n");
+
+    for (int j = 0; j < i; j++)
+    {
+        printf("%d, ",inputNum[vypis[j]]);
+    }
+        
+    return 0;
+}
+
+bool jeKopa(int i, int inputNum[SIZE]){
+    for (int j = (i-1)/2; j >= 0; j--)
+    {
+        int l =2*i+1 , r = 2*i+2;
+        if (l>=i)
+        {
+            continue;
+        }
+        if (inputNum[j]>inputNum[l] || inputNum[j]>inputNum[r])
+        {
+            printf("Nieje kopa");
+            return 0;
+        }
+        
+    }
+    
+    return 1;
+}
\ No newline at end of file