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#include <fstream>
using namespace std;
ifstream f("stergeri.in");
ofstream g("stergeri.out");
int n,m,k,x[100000],y[100000],ok,i;
bool u[100000];
int main()
{
f>>n>>m>>k;
for(i=1;i<=m;i++) f>>x[i]>>y[i];
ok=1;
while(ok)
{
ok=0;
for(i=1;i<=m;i++)
if(u[i]==0&&x[i]<=k) {
k=k+(y[i]-x[i]+1);
u[i]=1;
ok=1;
}
}
g<<k<<'\n';
f.close();
g.close();
return 0;
}