#include <iostream>
#include <vector>
using namespace std;
int main(){
int N;
cin >> N;
vector<int> v(N), w(N);
for (int i=0;i<N;i++){
cin >> v[i] >> w[i];
}
vector<int> values(5);
for (int i=0;i<5;i++) values[i] = (i * i * i * i + 2 * i * i) % 5 + 1;
//for (int i=0;i<5;i++) cout << values[i] << endl;
vector<vector<long long> > count_ways(N, vector<long long> (5));
vector<vector<long long> > count_choices(N, vector<long long> (5));
for (int i=0;i<N;i++){
for (int j=v[i];j<=w[i];j++){
count_choices[i][j % 5]++;
}
}
for (int i=0;i<5;i++) count_ways[N-1][i] = count_choices[N-1][i];
for (int i=N-2;i>=0;i--){
for (int j=0;j<5;j++){
for (int k=0;k<5;k++){
count_ways[i][j] += count_ways[i+1][(5 + j - k) % 5] * count_choices[i][k];
}
}
}
long long result = 0;
for (int i=0;i<5;i++) result += values[i] * count_ways[0][i];
//for (int i=0;i<5;i++) cout << count_ways[0][i] << endl;
cout << result << endl;
return 0;
}
