#include <cstdio>
#include <algorithm>

int main(){
    int A, B, S;
    scanf("%d %d %d", &A, &B, &S);

    int res;
    if(S == 1){
        res = std::abs(A-S) + 1;
    }else if(std::abs(A-S) <= std::abs(B-S)){
        res = std::abs(A-S) + S;
    }else{
        res = std::abs(B-S) + S - 1 + std::abs(A-1) + 1;
        if(A != 0){
            res = std::min(res, std::abs(B-S) + std::abs(A-S) + A);
        }
    }

    printf("%d\n", res);
}