谁知道我错哪了

#include<bits/stdc++.h>
using namespace std;
int ans,pd,last;
string s;

int main(){
	while(getline(cin,s)){
		ans=0,pd=0,last=0;
		for(int i=0;i<s.size();){
			if(s[i]==' ') i++;
			else{
				string x="";
				while(s[i]!=' '&&i<s.size()){
					x+=s[i];i++; 
				}
				if(x=="negative") pd=1;
				else if(x=="zero") last+=0;
				else if(x=="one") last+=1;
				else if(x=="two") last+=2;
				else if(x=="three") last+=3;
				else if(x=="four") last+=4;
				else if(x=="five") last+=5;
				else if(x=="six") last+=6;
				else if(x=="seven") last+=7;
				else if(x=="eight") last+=8;
				else if(x=="nine") last+=9;
				else if(x=="ten") last+=10;
				else if(x=="eleven") last+=11;
				else if(x=="twelve") last+=12;
				else if(x=="thirteen") last+=13;
				else if(x=="fourteen") last+=14;
				else if(x=="fifteen") last+=15;
				else if(x=="sixteen") last+=16;
				else if(x=="seventeen") last+=17;
				else if(x=="eighteen") last+=18;
				else if(x=="nineteen") last+=19;
				else if(x=="twenty") last+=20;
				else if(x=="thirty") last+=30;
				else if(x=="forty") last+=40;
				else if(x=="fifty") last+=50;
				else if(x=="sixty") last+=60;
				else if(x=="seventy") last+=70;
				else if(x=="eighty") last+=80;
				else if(x=="ninety") last+=90;
				else if(x=="hundred"){
					last*=100;
				}else if(x=="thousand"){
					ans+=last*1000,last=0;
				}else if(x=="million"){
					ans+=last*1000000,last=0;
				}
			}
		}
		ans+=last;
		if(pd==1) cout<<-ans<<endl;
		else cout<<ans<<endl;
	}
	return 0;
}