#include<iostream> #include<string> using namespace std; int StrtoInt(string str) { int sum=0; int len=str.length(); for(int i=0;i<len;i++) { if(str[i]>='0'&&str[i]<='9') sum=sum*16+str[i]-'0'; else if(str[i]>='a'&&str[i]<='f') sum=sum*16+str[i]-'a'+10; else if(str[i]>='A'&&str[i]<='F') sum=sum*16+str[i]-'A'+10; } return sum; } int main() { string str1; cin>>str1; int result=StrtoInt(str1); cout<<result<<endl; system("pause"); }