#include <iostream> using namespace std; int count(string s,int m,int n) { int res=0; for(int i=0;i<s.length();) { int carry=0,t; for(int j=i;j<s.length();j++) { t=carry; carry=(carry*m+s[j]-'0')%n; s[j]=(t*m+s[j]-'0')/n+'0'; } if(carry==1) res++; while(s[i]=='0') i++; } return res; } int main() { string s;//适用于大数,不仅限于int while(cin>>s) { cout<<count(s,10,2)<<endl; } } // 64 位输出请用 printf("%lld")