#include <stdio.h>

int main()

{

long n,m,k,i,v[10001],v2[10001];

freopen("stergeri.in","r",stdin);

freopen("stergeri.out","w",stdout);

scanf("%ld%ld%ld",&n,&m,&k);

for (i=1;i<m+1;i++)

{

scanf("%ld%ld",&v[i],&v2[i]);

}

for (i=m;i>0;i--)

{

if (k>v[i]-1) k=k+v2[i]-v[i]+1;

}

printf("%ld",k);

return 0;


}