diff --git a/2017/2017_jul_1.c b/2017/2017_jul_1.c
new file mode 100644
index 0000000..3456c89
--- /dev/null
+++ b/2017/2017_jul_1.c
@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX 100
+
+typedef struct Covek
+{
+	int A, B;
+	unsigned int poruka : 1;
+};
+int Ucitaj(Covek *niz)
+{
+	int n = 0;
+	printf("unesi broj osoba:");
+	scanf("%d", &n);
+	if (n > MAX && n < 0)
+		return -1;
+	for (int i = 0; i < n; i++)
+	{
+		printf("Unesi prijatelja za osobu %d: ",i);
+		scanf("%d %d", &niz[i].A, &niz[i].B);
+	}
+	for(int i=0;i<n;i++)
+	{
+		if (niz[i].A > -1)
+		{
+			if (niz[niz[i].A].A != i && niz[niz[i].A].B != i)
+				return -1;
+		}
+		else if(niz[i].B > -1)
+		{
+			if (niz[niz[i].B].A != i && niz[niz[i].B].B != i)
+				return -1;
+		}
+	}
+
+	return n;
+}
+int IzaberiOsobu(Covek *niz,int n)
+{
+	int num;
+	printf("Izaberi osobu od poverenja:");
+	scanf("%d", &num);
+	if (num<n && num>-1)
+	{
+		niz[num].poruka = 1;
+		return num;
+	}
+	else return -1;
+}
+void Prosledi(Covek *niz, int num)
+{
+	niz[num].poruka = 1;
+	if (niz[num].A != -1)
+		if(niz[niz[num].A].poruka == 0)
+		Prosledi(niz, niz[num].A);
+	if(niz[num].B != -1)
+		if(niz[niz[num].B].poruka == 0)
+		Prosledi(niz, niz[num].B);
+		
+}
+void Print(Covek *niz, int n)
+{
+	for (int i = 0; i < n; i++)
+	{
+		if(niz[i].poruka==0)
+			printf("Ne dobija %d \n", i);
+	}
+}
+void main()
+{
+	Covek niz[MAX];
+	int n;
+	if ((n = Ucitaj(niz)) == -1)
+	{
+		printf("Error1");
+		exit(0);
+	}
+	int num;
+	if ((num=IzaberiOsobu(niz,n)) ==-1)
+	{
+		printf("Error2");
+		exit(0);
+	}
+	Prosledi(niz, num);
+	Print(niz, n);
+	system("pause");
+
+}
\ No newline at end of file