Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Class | No | Team | Drivers | Chassis | Engine | Laps |
| --- | --- | --- | --- | --- | --- | --- |
| S\n1.6 | 160 | Silvestre Semilia | Silvestre Semilia\n Giuseppe Crescenti | Alfa Romeo Giulia Spider | Alfa Romeo 1.6 I4 | 6 |
| GT\n1.6 | 186 | Luigi Rinaldi | Luigi Rinaldi\n Mario Radicella | Alfa Romeo GTA | Alfa Romeo 1.6 I4 | 6 |
| P\n3.0 | 14 | Autodelta SpA | Toine Hezemans\n Masten Gregory | Alfa Romeo T33/3 | Alfa Romeo 3.0L V8 | 5 |
| P\n2.0 | 52 | Etna | "Peter von Serzawa"\n Santo Scigliano | Fiat 124 Spider | Fiat 2.0L I4 | 5 |
| GT\n1.6 | 188 | Etna | Checco D'Angelo\n "Jimmy" | Alfa Romeo GTA | Alfa Romeo 1.6L I4 | 5 |
| GT\n1.3 | 288 | V10 Kleber | Ferdi Bökmann\n Hans E. Böhm | Simca 1300 | Simca 1.3L I4 | 5 |
| GT\n2.0 | 128 |  | Ignazio Capuano\n Giancarlo Barba | Porsche 911S | Porsche 2.0L Flat-6 | 4 |
| GT\n1.6 | 180 | Scuderia Pegaso | Paolo de Luca\n Giuseppe Vassallo | Alfa Romeo GTA | Alfa Romeo 1.6L I4 | 4 |
| S\n1.6 | 156 | Scuderia Pegaso | Salvatore Barraco\n "Amphicar" | Alfa Romeo Giulia TZ | Alfa Romeo 1.6L I4 | 3 |
| S\n1.6 | 156 | Etna | Giuseppe D'Amico\n Girolamo Perniciaro | Alfa Romeo Giulia TZ | Alfa Romeo 1.6L I4 | 3 |
| GT\n1.6 | 192 | Scuderia Pegaso | Giovanni Dell'Olio\n Vincenzo Virgilio | Alfa Romeo GTA | Alfa Romeo 1.6L I4 | 3 |
| GT\n1.6 | 198 | Salvatore Gagliano | Salvatore Gagliano\n Alfonso di Garbo | Alfa Romeo GTA | Alfa Romeo 1.6L I4 | 3 |
| GT\n1.6 | 204 | Gianluigi Verna | Francesco Cosentino\n Gianluigi Verna | Alfa Romeo GTA | Alfa Romeo 1.6L I4 | 3 |
| P\n1.0 | 254 | Romano Martini | Francesco Patané\n "Oras" | Fiat-Abarth 1000SP | Abarth 1.0L I4 | 3 |
| GT\n1.6 | 264 | Romano Martini | Romano Martini\n Alessandro Federico | ATS 1000 SP | Ford 1.0L I4 | 3 |
| P\n3.0 | 38 | Abarth-Osella | Arturo Merzario\n Johannes Ortner | Abarth 3000SP | Abarth 3.0L V8 | 2 |
| P\n1.0 | 256 | Scuderia Brescia Corse | Luigi Moreschi\n "Patrizia" | AMS SP | Ford 1.0L I4 | 2 |
| P\n1.0 | 266 | "Gero" | "Gero"\n "Roger" | De Sanctis | Ford 1.0L I4 | 2 |
| GT\n1.6 | 276 | Scuderia Pegaso | Antonio Catalano\n Marco de Bartoli | Lancia Fulvia HF | Lancia 1.6L V4 | 2 |
| GT\n2.0 | 124 | Giampaolo Baruffi | Giancarlo Sala\n Giampaolo Baruffi | Porsche 911 | Porsche 2.0L Flat-6 | 1 |
| GT\n1.6 | 196 | Giovanni Rizzo | Giovanni Rizzo\n Stefano Alongi | Alfa Romeo GTA | Alfa Romeo 1.6L I4 | 1 |
| S\n1.3 | 232 | Aldo Bersano | Aldo Bersano\n William Scheeren | Abarth 1300S | Abarth 1.3L I4 | 1 |
| GT\n1.3 | 272 | Jolly Club | Antonio Trenti\n Alberto Fasce | Lancia Fulvia HF | Lancia 1.6L V4 | 1 |
| P\n3.0 | 20 | Porsche System | Vic Elford\n Hans Herrmann | Porsche 908/03 | Porsche 3.0L Flat-8 | 0 |
| P\n3.0 | 32 | Autodelta SpA | Umberto Maglioli\n Nanni Galli | Alfa Romeo T33/3 | Alfa Romeo 3.0L V8 | 0 |
| GT\n1.6 | 204 | Antonio Guagliardo | Antonio La Luce\n Antonio Guagliardo | Abarth 2000S | Alfa Romeo 1.6L I4 | 0 |
| P\n1.3 | 220 | Jack Wheeler | Jack Wheeler\n Martin Davidson | Jerboa SP | BMC 1.3L I4 | 0 |
| S\n1.3 | 234 | Settecolli | Enzo Buzzetti\n Gianni Marini | Abarth 1300S | Abarth 1.6L I4 | 0 |
| GT\n1.3 | 280 | Scuderia Pegaso | Giuseppe Chiaramonte\n Giuseppe Spatafora | Lancia Fulvia HF | Lancia 1.6L V4 | 0 |
Question:
name the only american who did not finish the race.
Answer:
Masten Gregory