diff --git a/pgms/modifiedprefix.cpp b/pgms/modifiedprefix.cpp
new file mode 100644
index 0000000..59f3b63
--- /dev/null
+++ b/pgms/modifiedprefix.cpp
@@ -0,0 +1,102 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+ bool isnotchar(string x){
+ 	if(x=="(" || x==")" || x=="+" || x=="*")
+ 		return false;
+ 	return true;
+ }
+
+  bool ischar(string x){
+ 	if(x=="(" || x==")" || x=="+" || x=="*")
+ 		return true;
+ 	return false;
+ }
+
+int preexpe(vector<string>ex){
+	stack<string>s;
+	int n=ex.size();
+	if(ex.size()==1){
+		int x=stoi(ex[0]);
+		return x;
+	}
+	for(int i=0;i<n;i++){
+		if(ex[i]=="(")
+			s.push(ex[i]);
+		else if(ex[i]=="+" || ex[i]=="*" || (isnotchar(ex[i]) && ischar(s.top()))){
+			s.push(ex[i]);
+			
+			}
+		else if(isnotchar(ex[i]) && isnotchar(s.top())){
+			int x=stoi(s.top());
+			int y=stoi(ex[i]);
+			s.pop();
+			string op=s.top();
+			s.pop();
+			if(op=="+"){
+				int ans =x+y;
+				if(i+1<n && isnotchar(ex[i+1]))
+					s.push(op);
+				string str= to_string(ans);
+				s.push(str);
+			}
+			else if(op=="*"){
+				int ans =x*y;
+				if(i+1<n && isnotchar(ex[i+1]))
+					s.push(op);
+				string str= to_string(ans);
+				s.push(str);
+			}
+		}
+		else{
+			int ans;
+			while(1){
+				ans=stoi(s.top());
+				s.pop();
+				if(s.top()=="(")
+					break;
+				int x=stoi(s.top());
+				int y=ans;
+				s.pop();
+				string op=s.top();
+				s.pop();
+				if(op=="+"){
+					ans =x+y;
+					if(i+1<n && isnotchar(ex[i+1]))
+						s.push(op);
+					string str= to_string(ans);
+					s.push(str);
+				}
+				else if(op=="*"){
+					ans =x*y;
+					if(i+1<n && isnotchar(ex[i+1]))
+						s.push(op);
+					string str= to_string(ans);
+					s.push(str);
+				}
+			}
+
+			s.pop();
+			string str= to_string(ans);
+			s.push(str);
+		}
+			
+	}
+		int ans=stoi(s.top());
+		return ans;
+}
+			
+			
+		
+int main(){
+	int n;
+	cin>>n;
+	vector<string>v;
+	int  i;
+	for(i=0;i<n;i++){
+		string x;
+		cin>>x;
+		v.push_back(x);
+	}
+	cout<<preexpe(v)<<"\n";
+}