diff --git a/Codes/1986 D - Mathematical Problem/1986D.cpp b/Codes/1986 D - Mathematical Problem/1986D.cpp
new file mode 100644
index 0000000..d106c3e
--- /dev/null
+++ b/Codes/1986 D - Mathematical Problem/1986D.cpp	
@@ -0,0 +1,85 @@
+#include <bits/stdc++.h>
+using namespace std;
+#ifdef ONLINE_JUDGE
+#define dbg(...)
+#else
+#include "Assets/debug.h"
+#endif
+#define int long long
+#define ll long long
+#define endl '\n'
+#define all(x) x.begin(), x.end()
+#define sz(x) (int)(x).size()
+#define yes cout << "YES" << endl
+#define no cout << "NO" << endl
+#define rep(i,a,b)  for(int i=a; i<b; ++i)
+#define rrep(i,a,b) for(int i=a; i>=b; --i)
+#define FAST (ios_base::sync_with_stdio(false), cin.tie(nullptr));
+ll pow(ll x,ll y,ll m=1e9+7){ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
+
+void solve()
+{
+    int n;
+    string s;
+    cin>>n>>s;
+    if(n<3)
+    {
+        cout<<stoi(s)<<endl;
+        return;
+    }
+    if(s[0]=='0' || s[n-1]=='0')
+    {
+        cout<<0<<endl;
+        return;
+    }
+    int mn=INT_MAX;
+    if(n==3)
+    {
+        int a,b,x,y;
+        x=s[0]-'0';
+        y=s[2]-'0';
+        a=stoi(s.substr(0,2));
+        b=stoi(s.substr(1,2));
+        mn = min(mn, x+b);
+        mn = min(mn, x*b);
+        mn = min(mn, y+a);
+        mn = min(mn, y*a);
+        cout<<mn<<endl;
+        return;
+    }
+    for(int i=0; i<n-1; ++i)
+    {
+        if(s[i]=='0')
+        {
+            cout<<0<<endl;
+            return;
+        }
+        int sum=0,ct=0;
+        for(int j=0; j<i; ++j) 
+        {
+            sum += s[j]-'0';
+            if(s[j]=='1')   ct++;
+        }
+        int num=stoi(s.substr(i,2));
+        sum+=num;
+        for(int k=i+2; k<n; ++k)    
+        {
+            sum += s[k]-'0';
+            if(s[k]=='1')   ct++;
+        }
+        mn = min(mn,sum-ct);
+    }
+    cout<<mn<<endl;
+}
+
+signed main()
+{
+    FAST;
+    int TCS = 1;
+    cin >> TCS;
+    for (int TC = 1; TC <= TCS; ++TC)
+    {
+      // cout<<"Case "<<TC<<": ";
+      solve();
+    }
+}
\ No newline at end of file
diff --git a/Readme.md b/Readme.md
index bc24f59..023f80f 100644
--- a/Readme.md
+++ b/Readme.md
@@ -352,6 +352,7 @@ This repository contains my solutions of Codeforces problems. They are in C++ la
 | 340 | 1986 A | X Axis | [Question](https://codeforces.com/problemset/problem/1986/A) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1986%20A%20-%20X%20Axis)
 | 341 | 1986 B | Matrix Stabilization | [Question](https://codeforces.com/problemset/problem/1986/B) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1986%20B%20-%20Matrix%20Stabilization)
 | 342 | 1986 C | Update Queries | [Question](https://codeforces.com/problemset/problem/1986/C) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1986%20C%20-%20Update%20Queries)
+| 343 | 1986 D | Mathematical Problem | [Question](https://codeforces.com/problemset/problem/1986/D) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1986%20D%20-%20Mathematical%20Problem)