#include<cstdio> 
#include<cstring>
#include<string>
#include<algorithm>
#include<iostream>
using namespace std;
const int maxn = 5003;
struct bign{
    int len, s[maxn];
    bign(){
        memset(s,0,sizeof(s));
        len= 1;
    }
    bign(int num){ *this = num;}
    bign(const char *num){ *this = num;}
    bign operator = (const int num){
        char s[maxn];
        sprintf(s,"%d",num);
        return *this = s;
    }
    bign operator = (const char *num){
        for(int i = 0; num[i] && num[i] =='0'; ++num) ;
        len = strlen(num);
        for(int i = 0; i < len; ++i)
            s[i] = num[len-1-i] -'0';
        return *this;
    }
    bign operator + (const bign &b) const {
        bign c;
        c.len = 0;
        int maxlen = max(len, b.len);
        for(int i = 0, g = 0; g || i < maxlen; ++i){
            int x = g;
            if(i < len) x += s[i];
            if(i < b.len) x += b.s[i];
            c.s[c.len++] = x % 10;
            g = x / 10;
        }
        return c;
    }
    bign operator += (const bign &b){
        return *this = *this + b;
    }
    void clean(){
        while(len >1 && !s[len-1]) --len;
    }
    bign operator * (const bign &b) const {
        bign c;
        c.len = len + b.len;
        for(int i = 0; i < len; ++i)
            for(int j = 0; j < b.len; ++j)
                c.s[i+j] += s[i] * b.s[j];
                
        for(int i = 0; i < c.len; ++i){
            c.s[i+1] += c.s[i]/10;
            c.s[i] %= 10;
        }
        c.clean();
        return c;
    }
    bign operator *= (const bign &b){
        return *this = *this * b;
    }
    bign operator -(const bign &b) const {
        bign c;
        c.len = 0;
        for(int i = 0, g = 0; i < len; ++i){
            int x = s[i]- g;
            if(i < b.len) x -= b.s[i];
            if(x >= 0) g = 0;
            else{
                g = 1;
                x += 10;
            }
            c.s[c.len++] = x;
        }
        c.clean();
        return c;
    }
    bign operator -= (const bign &b){
        return *this = *this - b;
    }
    bign operator / (const bign &b) const {
        bign c, f = 0;
        for(int i = len-1; i >= 0; --i){
            f *= 10;
            f.s[0] = s[i];
            while(f >= b){
                f -= b;
                ++c.s[i];
            }
        }
        c.len = len;
        c.clean();
        return c;
    }
    bign operator /= (const bign &b){
        return *this = *this / b;
    }
    bign operator % (const bign &b) const {
        bign r = *this / b;
        return *this- r*b;
    }
    bign operator %= (const bign &b){
        return *this = *this % b;
    }
    bool operator < (const bign &b) const {
        if(len != b.len)    return len < b.len;
        for(int i= len-1; i>=0; --i)
            if(s[i] != b.s[i])    return s[i] < b.s[i];
        return 0;
    }
    bool operator > (const bign &b) const {
        if(len != b.len)    return len > b.len;
        for(int i = len-1; i >= 0; --i)
            if(s[i] != b.s[i])    return s[i] > b.s[i];
        return 0;
    }
    bool operator == (const bign &b) const {
        return !(*this < b || *this > b);
    }
    bool operator != (const bign &b) const {
        return !(*this == b);
    }
    bool operator <= (const bign &b) const {
        return *this < b || *this == b;
    }
    bool operator >= (const bign &b) const {
        return *this > b || *this == b;
    }
    string str() const {
        string res = "";
        for(int i = 0; i < len; ++i)
            res = char(s[i]+'0') + res;
        return res;
    }
};
istream& operator >> (istream &in, bign &x){
    string s;
    in >> s;
    x = s.c_str();
    return in;
}
ostream& operator << (ostream &out, const bign &x){
    out << x.str();
    return out;
}
bign n, a, b;
int main(){
    cin >> n >> a >> b;
    if(a > b){putchar('0'); return 0;}
    if(n == 1 && a != b){putchar('0'); return 0;}
    cout << (b * (n - 2) - a * (n - 2) + 1);
    return 0;
}

Measured memory_bytes: 384