diff --git a/17NumberSystemtoDecimal.cpp b/17NumberSystemtoDecimal.cpp
new file mode 100644
index 0000000..7bffb90
--- /dev/null
+++ b/17NumberSystemtoDecimal.cpp
@@ -0,0 +1,31 @@
+#include <bits/stdc++.h>
+using namespace std;
+int main(){
+    char hex[17];
+    long long ans=0,tp1;
+    int len,val;
+    
+    cin>>hex;
+    
+    len=strlen(hex);
+    
+    for(int i=0;len>0;i++){
+        if(hex[i]>='0' && hex[i]<='9'){
+            val = (hex[i] - '0');
+        }
+        else if(hex[i]>='a' && hex[i]<='g'){
+            val = (hex[i] - 'a')+10;
+        }
+        else if(hex[i]>='A' && hex[i]<='G'){
+            val = (hex[i] - 'A')+10;
+        }
+        else{
+            cout<<"error";
+        }
+        cout<<val<< " "<<len<<" "<<ans<<endl;
+        ans+=val*pow(17,len-1);
+        len--;
+    }
+    cout<<ans;
+    return 0;
+}