#include<stdio.h>
long long replaceZerWithOne(long long n){
    if(n==0)
    return 1;
    long long sign=1;
    if(n<0){
        sign=-1;
        n=-1;
    }
    long long result=0,place=1;
    while(n>0){
        int digit=n%10;
        if(digit==0)
        digit=1;
        result=digit*place+result;
        place*=10;
        n/=10;
    }
    return sign*result;
}
int main(){
    long long n;
    scanf("%lld",&n);
    printf("%lld",replaceZeroWithOne(n));
    return 0;
}