#include<stdio.h>#include<string.h>#include<math.h>double eps=1e-6;char s[2000];int s1[1000];int s2[1000];int top;void arr(){int i,tmp=0,zhishu,xishu;bool fu=0,zs=0,xs=0;for(i=0;i<strlen(s);i++){if(s[i]=='=')break;if(s[i]>='0' && s[i]<='9')tmp=tmp*10+s[i]-'0';if(s[i]=='-')fu=1;if(s[i]=='^'){tmp=0;zs=1;}if(s[i]=='x'){if(tmp==0)tmp=1;xishu=tmp;if(fu)xishu=-xishu;fu=0;tmp=0;xs=1;}if(s[i]==' '){if(zs && xs){zhishu=tmp;if(fu) zhishu=-zhishu;}else if(!zs && xs)zhishu=1;else{xishu=tmp;if(fu)xishu=-xishu;zhishu=0;}s1[top]=xishu;s2[top++]=zhishu;zs=0;xs=0;fu=0;zhishu=xishu=tmp=0;}}}double abs(double n){if(n<0)return -n;return n;}double f1(double x){int i;double sum=0;for(i=0;i<top;i++)sum+=pow(x,(double)s2[i])*(double)s1[i];return sum;}double f2(double x){int i;double sum=0;for(i=0;i<top;i++)if(s2[i])sum+=pow(x,(double)s2[i]-1)*(double)s1[i]*s2[i];return sum;}int solve(double x){double ff1,ff2;double y;int cnt=0;while(1){ff1=f1(x),ff2=f2(x);y=x-ff1/ff2;if(abs(x-y)<eps || abs(ff1)<eps || cnt>=1002)break;x=y;cnt++;}return cnt;}int main(){double n;int i;while(gets(s)){top=0;scanf("%lf",&n);arr();int cnt=solve(n);if(cnt>1000)printf("Bad x0 or bad equation!n");elseprintf("%dn",cnt);getchar();}}
