diff --git a/du3/program.c b/du3/program.c
new file mode 100644
index 0000000..2f68391
--- /dev/null
+++ b/du3/program.c
@@ -0,0 +1,52 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+int main()
+{
+    
+    
+char *str;
+str = (char*) malloc(12);
+scanf("%s",str);
+int day=0;
+int m=0;
+int y=0;
+if(str[1]=='.'){
+    day+=str[0]-48;
+    m+=(str[2]-48)*10+(str[3]-48);
+    y+=(str[5]-48)*1000+(str[6]-48)*100+(str[7]-48)*10+str[8]-48;
+}
+else{
+    day+=(str[0]-48)*10+(str[1]-48);
+    m+=(str[3]-48)*10+(str[4]-48);
+    y+=(str[6]-48)*1000+(str[7]-48)*100+(str[8]-48)*10+str[9]-48;
+}
+if( (day<0 || day>=31)||(m<0 || m>12)){
+    return 0;
+}
+
+day+=7;
+if(day>31 && m%2!=0){
+    day-=31;
+    m++;
+}
+else if(day>30 && m%2==0){
+    if(m==2 &&(y%400==0 ||(y%100!=0 && y%4==0))){
+        day-=29;
+    }
+    else{
+    day-=31;
+    }
+    m++;
+}
+if(m>12){
+    m-=12;
+    y++;
+}
+
+printf("%d.%d.%d",day,m,y);
+
+
+    return 0;
+}
+