diff --git a/du3/program.c b/du3/program.c
index e69de29..af0090a 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -0,0 +1,63 @@
+#include <stdio.h>
+
+int main(){
+    int day;
+    int month;
+    int year;
+    scanf("%d.%d.%d", &day, &month, &year);
+    if(day < 1 || day > 31 || month < 1 || month > 12 || year < 0){
+        puts("Nespravny datum");
+        return 0;
+    }
+    if(month == 2 && day > 29){
+        puts("Nespravny datum");
+        return 0;
+    }
+    if(year % 4 != 0 && month == 2 && day > 28){
+        puts("Nespravny datum");
+        return 0;
+    }
+    if(month == 4 || month == 6 || month == 9 || month == 11){
+if(day > 30){
+        puts("Nespravny datum");
+        return 0;
+}
+    }
+
+    day += 7;
+    if(year % 4 != 0 && month == 2 && day > 28){
+        month++;
+        day -= 28;
+    }
+    else if(month == 2 && day > 29){
+        month++;
+        day -= 29;
+    }
+    else if(month == 4 || month == 6 || month == 9 || month == 11){
+if(day > 30){
+        month++;
+        day -= 30;
+}
+    }
+    else if(day > 31){
+        month++;
+        day -= 31;
+    }
+    if(month == 13){
+        month = 1;
+        year++;
+    }
+
+    if(month < 10 && day < 10){
+        printf(" %d.0%d.%d\n\n", day, month, year);
+    }
+    else if(month < 10){
+        printf("%d.0%d.%d\n\n", day, month, year);
+    }
+    else if(day < 10){
+        printf(" %d.%d.%d\n\n", day, month, year);
+    }
+    else{
+        printf("%d.%d.%d\n\n", day, month, year);
+    }
+}
\ No newline at end of file