#include <stdio.h>

int main(){
	long long val = 0;
	scanf("%lld",&val);
	
	int count = 0;
	while(val != 1000000007){
		if(val > 1000000007){
			val %= 10;
			count++;
		}else{
			val *= 10;
			count++;
		}
	}
	printf("%d",count);
}