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#include <bits/stdc++.h>
using namespace std;
ifstream f("stergeri.in");
ofstream g("stergeri.out");
int a[20000001],n,m,poz,x1,x2,curent;
int main()
{
f>>n>>m>>poz;
curent=n;
for(int i=1;i<=n;i++)
a[i]=i;
for(int k=1;k<=m;k++)
{
f>>x1>>x2;
for(int i=x2+1;i<=curent;i++)a[i-x2+x1-1]=a[i];
curent=curent-x2+x1-1;
}
g<<a[poz];
return 0;
}