diff --git a/algorithms/Maths/Digitsum in Base a b/algorithms/Maths/Digitsum in Base a
new file mode 100644
index 0000000..8cb8069
--- /dev/null
+++ b/algorithms/Maths/Digitsum in Base a	
@@ -0,0 +1,17 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+#define ll long long int
+
+int digitsum(ll N,int a){
+    if(N==0) return 0;
+    int ret=0;
+    ret+=digitsum(N/a,a)+N%a;
+    return ret;
+}
+
+int main(){
+  int n,a;
+  cin>>n>>a;
+  cout<<digitsum(n,a);
+}