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#include <iostream>
#include <fstream>
using namespace std;
int mat[100001][3];
int main()
{
ifstream fin("stergeri.in");
ofstream fout("stergeri.out");
int n, m, k, nr=0;
fin >> n >> m >> k;
for(int i=1; i<=m; i++){
fin >> mat[i][1] >> mat[i][2];
}
nr=k;
for(int i=m; i>=1; i--){
if(mat[i][2]<=nr){
nr=nr+mat[i][2]-mat[i][1]+2;
}
else if(mat[i][1]<=nr){
nr=nr+mat[i][2]-nr+1;
}
}
fout << nr;
return 0;
}