#include<bits/stdc++.h>
using namespace std;
int n,m,k,a[100005],b[100005];
int main()
{
    freopen("stergeri.in","r",stdin);
    freopen("stergeri.out","w",stdout);
    scanf("%d%d%d",&n,&m,&k);
    for(int i=1;i<=m;i++)
    {
        scanf("%d%d",&a[i],&b[i]);
    }
    for(int i=m;i>=1;i--)
    {
        if(k>=a[i]) k=k+(b[i]-a[i]+1);
    }
    printf("%d\n",k);
    return 0;
}